N-Nitroso-Vancomycin Impurity 25

(4S,7R,8R,23R,24S,27R,37R,39aR) -45- (((2R,3S,4R,5S,6S) -3- (((2S,4S,5S,6S) -4-amino-5-hydroxy-4,6-dimethyltetrahydro-2H-pyran-2-yl) oxy) -4,5-dihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) -11,44-dichloro-8,23,29,31,33-pentahydroxy-7- ((R) -4-methyl-2- (methyl (nitroso) amino) pentanamido) -2,6,25,39,40-pentaoxo-1,2,3,4,5,6,7,8,24,25,26,27,37,38,39,39a-hexadecahydro-23H-24,37- (epiminomethano) -9,12:19,22-dietheno-14,17:32,36-di (metheno) benzo[n][1]oxa[6,10]diazacycloheptadecino[4,5-d][1]oxa[7,17]diazacyclotetracosine-4,27-dicarboxylic acid