1. A porphyrin similar to the pheophorbide of the chlorophylls but with the vinyl group replaced by an ethyl group, with no methoxycarbonyl group, and minus two hydrogen atoms, producing one more double bond in ring D.
2. Any plant porphyrin.
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DFS occurs when hepatotoxic substances, whether chemical factors (phenothiazine, tetracycline or sulfonamide) or biological factors (toxic plants or infectious agents like the fungus Phytomices chartarum) cause sufficient damage the liver to prevent excretion of photoactive phytoporphyrins (13).