Benzoic acid (S)-((4S,4aS,8aR,9R,9aR,10aR)-9-methoxy-7,7-dimethyl-hexahydro-1,3,6,8,10-pentaoxa-anthracen-4-ylcarbamoyl)-((2R,5R,6R)-2-methoxy-5,6-dimethyl-4-methylene-tetrahydro-pyran-2-yl)-methyl ester