Tacrolimus EP Impurity I

Chemical Name: (3S,4R,5E,8R,9E,12S,14S,15R,16S,18R,19R,26aS)-19-hydroxy-3-[(1E)-1-[(1R,3R,4R)-4-hydroxy-3-methoxycyclohexyl]prop-1-en-2-yl]-14,16-dimethoxy-4,10,12,18-tetramethyl-8-(prop-2-en-1-yl)-3,4,8,11,12,13,14,15,16,17,18,19,24,25,26,26a- hexadecahydro-7H-15,19-epoxypyrido[2,1-c][1,4]oxaazacyclotricosine-1,7,20,21(23H)-tetrone (as per EP); (14E,18E)-17-Allyl-1-hydroxy-12-[(E)-2-(4-hydroxy-3-methoxycyclohexyl)-1-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9] octacosa-14,18-diene-2,3,10,16-tetrone (as per USP)