(αR, S)-α-Hydroxy- β-[(1-oxobutyl)amino]benzenepropanoic Acid (2aR,S,4S,6R,S,1S,1S,12aR,12S)-6,12bBbS(acetyloxy)-12-(benzoyloxy)-2a,3,4,4a,5,6,9,10,11,12,12a,12b-dodecahydro-4,11-dihydroxy-4a,8,13,13-tetramethyl-5-oxo-7,11-methano-1H-cyclodeca[3,4]benz[1,2-b]oxet-9-yl Ster; [2aR-[2aα,4 β,4a β,6 β,9α(αR*, S*),11α,12α,12aα,12bα]]-α-Hydroxy- β-[(1-oxobutyl)amino]benzenepropanoic Acid 6,12b-BS(acetyloxy)-12