- 6-((Benzyloxy)carbonyl)-2-(tert-butoxycarbonyl)-2,6-diazaspiro[3.4]octane-8-carboxylic acid,95%, 250mg
- 6-((Benzyloxy)carbonyl)-2-(tert-butoxycarbonyl)-2,6-diazaspiro[3.4]octane-8-carboxylic acid,95%, 100mg