Pheophorbide b ethyl ester from a chlorella vulgaris dietary supplement

Abstract

In the title compound, C37H38N4O 6, four five-membered nitro-gen-bearing rings are nearly coplanar. Two N atoms in two these five-membered rings have attached H atoms, which contribute to the formation of intra-molecular N - H ... N hydrogen bonds [N ... N = 2.713 (5)-3.033 (6) Å].