| [Synonyms] 
 Tacrolimus Impurity 16
 Tacrolimus impurityQ: What is 
Tacrolimus impurity Q: What is the CAS Number of 
Tacrolimus impurity
 15,19-Epoxy-3H-pyrido[2,1-c][1,4]oxaazacyclotricosine-1,7,20,21(4H,23H)-tetrone, 8,11,12,13,14,15,16,17,18,19,24,25,26,26a-tetradecahydro-19-hydroxy-3-[2-(4-hydroxy-3-methoxycyclohexyl)-1-methylethenyl]-14,16-dimethoxy-4,10,12,18-tetramethyl-8-(2-propen-1-yl)-
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