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2(S)-Methylbutyric acid (1S,3R,7S,8S,8aR)-8-[2-[(4R,6R)-4-[N-(2-hydroxyethyl)carbamoylmethyl]-3-(4-hydroxy-3-methoxybenzyl)-2-oxoperhydro-1,3-oxazin-6-yl]ethyl]-3,7-dimethyl-1,2,3,7,8,8a-hexahydronaph related products: