Fig. 4
From: Multicomponent reactions provide key molecules for secret communication
Readout of molecular keys via tandem-MS. a exemplary ESI-MS/MS spectrum. b Proposed fragment assignment. The monoisotopic mass of the intact molecule (circle containing cross) is the first information that significantly reduces the number of possibilities. Additionally, three fragments are necessary to unambiguously determine the combination of components. The three fragments marked in the blue frame (black circle, white square containing black square, and black square) are utilized in the computer analysis script (Supplementary Software 1) for assisted readout. The other fragments (black inverted triangle, diamond cluster, and asterisk) further confirm the structure, but are not essential for a successful readout
