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The first step (cyclization to the tetrahedral intermediate) of the succinimide formation from c[CH2CO–NGRC]–NH2 (CP15) found in the previous study [67]. RC: reactant complex; TS: transition state; IC: intermediate complex. These geometries are labeled by an asterisk (*) to indicate that they can be reproduced from the reported Cartesian coordinates [67] (see text). Grey: carbon; white: hydrogen; blue: nitrogen; red: oxygen; orange: phosphorus; yellow: sulfur.
