Etodolac EP Impurity D

Pseudoerythromycin A Enol Ether ; (2R, 3R, 6R, 7S, 8S, 9R, 10R)-7-[(2, 6-Dideoxy-3-C-methyl-3-O-methyl-?-L-ribo-hexopyranosyl)oxy]-3-[(1R, 2R)-1, 2-dihydroxy-1-methylbutyl]-2, 6, 8, 10, 12-pentamethyl-9-[[3, 4, 6-trideoxy-3-(dimethylamino)-?-D-xylohexopyranosyl]oxy]-4, 13-dioxabicyclo[8.2.1 ]tridec-1(12)-en-5-one ;