(3aS,5S,6aR,7S,9aR)-6-tert-butyl 5-methyl 2-thioxo-7-((triisopropylsilyl)oxy)-4,5,6a,7-tetrahydro-[1,3]dioxolo[4,5-d]indole-5,6(9aH)-dicarboxylate

(2S,7S,7aS)-1-tert-butyl 2-methyl 7-((triisopropylsilyl)oxy)-2,3,7,7a-tetrahydro-1H-indole-1,2-dicarboxylate