porphin

noun
por·phin | \ˈpȯr-fən \
variants: also porphine \-ˌfēn \

Medical Definition of porphin 

: a deep purple crystalline compound C20H14N4 that is made synthetically from pyrrole and formaldehyde, contains four pyrrole rings joined by =CH− groups so as to give a heterocyclic arrangement, and forms the essential skeletal structure of the porphyrins, heme, and chlorophyll

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