methyl 5-hydroxy-4-nitro-7-(tetrahydropyran-2'-yloxy)-heptanoate

2-cyano-3-(2-(tetrahydro-2H-pyran-2-yl)oxy) ethyl-4-(2-methoxycarbonylethyl)pyrrole

methyl-4-nitro-5-acetoxy-7-[(tetrahydro-2H-pyran-2-yl)oxy]-heptanoate

3-(2-ethoxycarbonyl-ethyl)-4-ethoxycarbonylmethyl-5-(hydroxyimino-methyl)-pyrrole-2-carboxylic acid ethyl ester

porphobilinogen lactam