Fig. 3
From: Repeated evolution of cytochrome P450-mediated spiroketal steroid biosynthesis in plants
Absolute structural elucidation of 1 by crystalline sponge X-ray diffraction analysis. a ORTEP diagram with 50% probability showing the asymmetric unit (ASU) of crystalline sponge-compound 1 complex. A single crystal of [(ZnCl2)3(tpt)2]n [tpt = 2,4,6-tri(4-pyridyl)-1,3,5-triazine] was used as the crystalline sponge. Three crystallographically independent molecules of 1 were observed in the ASU a–c. The solvent molecules acetone and water are highlighted by red and blue circles, respectively. b The structural model of 1 overlaid on the electron density map Fo contoured at the 2.0σ level (2.6 eÅ−3). The absolute stereochemistry of C16 and C22 is highlighted
