analogues of either griseofulvin or 3,5-diethoxycarbonyl-1,4-dihydrocollidine which do not decrease the chelatase activity are not porphyrogenic on their own , but can potentiate the porphyria caused by 3,5-diethoxycarbonyl-1,4-dihydrocollidine .
C0018242
griseofulvin
C0032708
porphyria