3¹,3²-Didehydrorhodochlorin-15-acetic Acid Trimethyl Ester

The structure of the title compound, methyl (2S,3S)-8-ethenyl-13-ethyl- 2,3-dihydro-18-methoxycarbonyl-20-methoxycarbonylmethyl-3,7,12,17- tetramethylporphyrin-2-propionate, C₃₇H₄₂N₄O₆, containing no solvent molecules of crystallization, has been determined at 193 (2) K. The subrings A, B and C of the chlorin macrocycle are approximately in the least-squares plane defined by the four N atoms. The reduced ring D is distorted owing to the steric repulsion between the C17 and C15 substituents. The crystal packing is dominated by π–π interactions between subrings A and C of adjacent molecules in a slipped parallel orientation.

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