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Related to chlorin: Chlorine gas
a toxic pungent greenish-yellow gas of the halogen group; the 15th most abundant element in the earth's crust, occurring only in the combined state, mainly in common salt: used in the manufacture of many organic chemicals, in water purification, and as a disinfectant and bleaching agent. Symbol: Cl; atomic no.: 17; atomic wt.: 35.4527; valency: 1, 3, 5, or 7; density: 3.214 kg/m3; relative density: 1.56; melting pt.: --101.03°C; boiling pt.: --33.9°C
A saturated porphyrin for which one double bond at a single pyrrole ring has been reduced.