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(3a'S,4S,5'R,8'S,9'S,9a'S,10'R)-10'-(2-chloroethyl)-2,2,2',2'-tetramethyl-7'-oxotetrahydro-5'H,7'H-spiro[[1,3]dioxolane-4,4'-[5,9]methano[1,3]dioxolo[4,5-d]oxocin]-8'-yl carbamate
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(3a'S,4S,6'R,7a'S,10a'S,10b'R,11'R)-11'-(2-chloroethyl)-2,2,9',9'-tetramethyldihydro-6'H-spiro[[1,3]dioxolane-4,7'-[6,10b]methano[1,3]dioxolo[4',5':5,6]oxocino[4,3-d]oxazole]-2',4'(1'H,3a'H)-dione
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(S)-2-(dimethylamino)-1-((3aS,4R,6S,7S,7aS)-6-hydroxy-2,2,2',2'-tetramethyltetrahydro-5H-spiro[benzo[d][1,3]dioxole-4,4'-[1,3]dioxolan]-7-yl)-2-oxoethyl pivalate
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