Methyl ((5S,10S,11S,14S)-11-benzyl-5-(tert-butyl)-10-hydroxy-15,15-dimethyl-12-nitroso-3,6,13-trioxo-8-(4-(pyridin-2-yl)benzyl)-2-oxa-4,7,8,12-tetraazahexadecan-14-yl)carbamate