(2R)-2-{[(5R,11R)-14-[(2S,5R,8R,11S)-11-(3-{[amino(azanylidene)methyl]amino}propyl)-5-[(4-hydroxyphenyl)methyl]-3,6,9,12,15-pentaoxo-8-(sulfanylmethyl)-1,4,7,10,13-pentazacyclopentadecan-2-yl]-1,4,7,10,13-pentaoxo-5,11-bis(sulfanylmethyl)-3,6,9,12-tetrazatetradec-1-yl]amino}-3-sulfanylpropanamide