Abstract
Large amounts of data are generated in chemistry labs—nearly all instruments record data in a digital form, yet a considerable proportion is also captured non-digitally and reported in ways non-accessible to both humans and their computational agents. Chemical research is still largely centred around paper-based lab notebooks, and the publication of data is often more an afterthought than an integral part of the process. Here we argue that a modular open-science platform for chemistry would be beneficial not only for data-mining studies but also, well beyond that, for the entire chemistry community. Much progress has been made over the past few years in developing technologies such as electronic lab notebooks that aim to address data-management concerns. This will help make chemical data reusable, however it is only one step. We highlight the importance of centring open-science initiatives around open, machine-actionable data and emphasize that most of the required technologies already exist—we only need to connect, polish and embrace them.

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Acknowledgements
This work was partially supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 666983, MaGic) and the Swiss National Science Foundation (SNSF) through the National Center of Competence in Research (NCCR) and Materials’ Revolution: Computational Design and Discovery of Novel Materials (MARVEL). We thank M. Evans, L. Talirz, M. Moosavi, M. Asgari, N. Marzari, G. Pizzi and fellow EPFL Data Champions for discussion and inputs and thank the cheminfo and Zakodium developers (among others, M. Zasso, D. Kostro, J. Wiest, A. M. Castillo, A. Bolaños, J. Osorio and N. Pellet; also see https://cheminfo.github.io/team for a list of contributors) for their invaluable contributions (conceiving and implementing many of the examples discussed in this perspective). Of course, we also thank the chemists whose feedback about our ELN implementation shaped our Perspective.
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K.M.J. and B.S. wrote the manuscript with inputs from L.P. All the authors contributed to discussions.
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L.P. is chief scientific officer of Zakodium Sàrl, a company dedicated to the development of tools for storing, processing and analysis of scientific information. All the authors are contributors to the cheminfo ecoystem.
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Extended data
Extended Data Fig. 1 Fragment of a NMR spectrum serialized to a classic standard format.
This is an example of a JCAMP-DX file. This format is a widely used IUPAC-recommended format for spectra that is, for example, supported by the cheminfo and chemotion ELNs. Also, spectra in many databases such as the NIST webbook or the Infrared & Raman Users Group (IRUG) Spectral Database can be downloaded in JCAMP-DX format. A JCAMP-DX file can contain multiple blocks of labelled data records (LDR). That is, one can store multiple related spectra (such as repeated measurements) in the same file. All data blocks must contain a CORE header with basic metadata such as OWNER, DATATYPE. The IUPAC working group also provides a vocabulary of further global labels such as for the temperature/pressure/CAS-number. Data can also be compressed using various compression schemes. Note that the JCAMP-DX format is only one, old standard, and many others have been proposed. The JCAMP-DX format, however, does allow for the addition of an unlimited number of private labels by using the ##$ prefix, which allows every system to tailor the format to its own needs. Drawbacks of this format are, however, that it does not come with native, standardised, support for semantic web features (such as linking to a vocabulary) and, in contrast to formats like xml, csv, or json, that it is not natively supported by many general purpose tools.
Extended Data Fig. 2 Fragment of a NMR spectrum serialized to a modern standard format.
We show another NMR dataset (taken from the SciData website from the Chalk Group at the University of North Florida) serialized to JSON-LD using the SciData data model82. One important part on the JSON-LD file is the @context field. The values in this field links to the vocabularies that are used for naming things in this datafile. For instance, for units, the vocabularies provided by qudt are used, whereas the method is described using the chemical methods ontology (from which it is clear that, for instance, NMR spectroscopy is—similar to electron spin resonance spectroscopy–a magnetic resonance method). Importantly, almost all modern programming languages provide support for reading such json files. The @type field can describe the format of the data, for instance, to let a computer now that it can expect a list of doubles. Different parts of the file (such as methodology, the dataset) can be access by their own address.
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Jablonka, K.M., Patiny, L. & Smit, B. Making the collective knowledge of chemistry open and machine actionable. Nat. Chem. 14, 365–376 (2022). https://doi.org/10.1038/s41557-022-00910-7
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DOI: https://doi.org/10.1038/s41557-022-00910-7
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