(29) S31, S32 tert-Butyl (30) S33, S34 TFA salt (ent-2.TFA) S35, S36 TFA salt (ent-3.TFA) S37, S38 triacetate (31) S39, S40 triacetate (32) S41, S42 tert-Butyl (E-33) S43, S44 tert-Butyl (E-34)
(29) tert-Butyl (30) S31, S32 TFA salt (ent-2.TFA) S33, S34 TFA salt (ent-3.TFA) S35, S36 triacetate (31) S37, S38 triacetate (32) S39, S40 tert-Butyl (E-33) S41, S42 tert-Butyl (E-34) S43, S44
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