(S)-N-((S)-1-Cyano-2-((S)-2-oxopyrrolidin-3-yl)ethyl)-7-((S)-3,3-dimethyl-2-(2,2,2-trifluoroacetamido)butanoyl)-1,4-dithia-7-azaspiro[4.4]nonane-8-carboxamide [ 2920904-06-7 ]