imidazole-1-carboxylic acid 10-(3-acetoxy-4-dimethylamino-6-methyl-tetrahydro-pyran-2-yloxy)-12-(5-acetoxy-4-methoxy-4,6-dimethyl-tetrahydro-pyran-2-yloxy)-2-ethyl-3,5,7,9,11,13-hexamethyl-6,14-dioxo-9-prop-2-ynyloxy-oxacyclotetradec-4-en-3-yl ester