Synonyms: | 9-Norketo FK-506;[3S-[3R*[E(1S*,3S*,4S*)],4S*,5R*,8S*,9E,12R*,14R*,15S*,16R*,18S*,19S*,25aR*]]-;Tacrolimus Impurity 22;9-Norketo Tacrolimus (9-Norketo FK-506);15,19-Epoxypyrido[2,1-c][1,4]oxaazacyclodocosine-1,7,20(22H)-trione, 3,4,5,6,8,11,12,13,14,15,16,17,18,19,23,24,25,25a-octadecahydro-5,19-dihydroxy-3-[2-(4-hydroxy-3-methoxycyclohexyl)-1-methylethenyl]-14,16-dimethoxy-4,10,12,18-tetramethyl-8-(2-propenyl)-, [3S-[3R*[E(1S*,3S*,4S*)],4S*,5R*,8S*,9E,12... |