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When N-alkylprotoporphyrins are prepared synthetically or biologically, a mixture of four regioisomers is obtained. For our… Expand A new technique for resolving N-alkylprotoporphyrins into each structural isomer is described. The technique has been used to… Expand Administration of 3,5-diethoxycarbonyl-4-ethyl-1,4-dihydro-2,6-dimethylpyridine (4-ethyl-DDC) to hamsters resulted in a marked… Expand 1. 3,5-Diethoxycarbonyl-4-ethyl-1,4-dihydro-2,6-dimethylpyridine (4-ethyl-DDC) gives rise to N-ethylprotoporphyrin in the liver… Expand The absolute orientation of the prosthetic heme group in the active site of a hemoprotein may influence its substrate selectivity… Expand Administration of 3,5-dicarbethoxy-1,4-dihydrocollidine (DDC) to rats causes the accumulation of N-methylprotoporphyrin IX, a… Expand