pyrroporphyrin
noun
pyr·ro·porphyrin
¦pi(ˌ)rō+
: a dark red crystalline pigment C32H36N4O2 with a violet metallic luster that is the lower homologue of phylloporphyrin and that differs from most porphyrins in being a hepta-substituted derivative of porphin rather than an octa-substituted one
Word History
Etymology
International Scientific Vocabulary pyrrh- + porphyrin