Bacteriochlorophylls c, d, e, and f are chlorins, meaning their molecules have a chlorin macrocycle ring with one reduced pyrrole ring (D).
As bacterioclorofilas c, d, e, e f son clorinas, o que significa que as súas moléculas teñen un anel macrocíclico de clorina cun anel pirrol reducido (D).