We don't have synonyms for porphyrins yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are porphyrio, porphyrin and porphyries.
(n) :
(organic chemistry) Any of a class of heterocyclic compounds containing pyrrole rings arranged in a square or other similar shape; they are important in biochemistry in a form with a metal atom in the central cavity (hemoglobin with iron, chlorophyll with magnesium, etc.).
(n) :
(organic chemistry) Any of a class of heterocyclic compounds containing pyrrole rings arranged in a square or other similar shape; they are important in biochemistry in a form with a metal atom in the central cavity (hemoglobin with iron, chlorophyll with magnesium, etc.).