Pheophorbide b ethyl ester from a chlorella vulgaris dietary supplement

Abstract

In the title compound, C37H38N4O6, four five-membered nitrogen-bearing rings are nearly coplanar. Two N atoms in two these five-membered rings have attached H atoms, which contribute to the formation of intramolecular N—H...N hydrogen bonds [N...N = 2.713 (5)–3.033 (6) Å].