Porphyrins

The porphyrins are a group of highly colored, naturally occurring pigments containing a tetrapyrrole porphine nucleus (Scheme 2) with substituents at the eight β positions of the pyrroles, and/or the four meso positions between the pyrrole rings.

The porphyrin family of compounds are cyclic tetrapyrolles many of which are intermediates of the heme biosynthetic pathway. The majority of ____ __________ ____ ____ _________ _____ _______ ____ _____ ________.
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