title: Pheophorbide b ethyl ester from a chlorella vulgaris dietary supplement.
abstract: In the title compound, C(37)H(38)N(4)O(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].
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Chin Fei
authors.initials: CF
authors.lastname: Chee
authors.forename: Noorsaadah Abdul
authors.initials: NA
authors.lastname: Rahman
authors.forename: Sharifuddin M
authors.initials: SM
authors.lastname: Zain
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng