2-[3-[(2S,5S,11R,14S)-14-[3-(diaminomethylideneamino)propyl]-11-[(4-hydroxyphenyl)methyl]-5-(naphthalen-2-ylmethyl)-3,6,9,12,15-pentaoxo-1,4,7,10,13-pentazacyclopentadec-2-yl]propyl]guanidine 2-[3-[(2S,5S,11R,14S)-14-(3-guanidinopropyl)-11-[(4-hydroxyphenyl)methyl]-5-(2-naphthylmethyl)-3,6,9,12,15-pentaoxo-1,4,7,10,13-pentazacyclopentadec-2-yl]propyl]guanidine 2-[3-[(2S,5S,11R,14S)-14-(3-guanidinopropyl)-11-(4-hydroxybenzyl)-3,6,9,12,15-pentaketo-5-(2-naphthylmethyl)-1,4,7,10,13-pentazacyclopentadec-2-yl]propyl]guanidine AIDS228435 Cyclo(-D-Tyr-Arg-Arg-Nal-Gly-) Cyclo(-Nal-Gly-D-Tyr-Arg-Arg-) FC 131 FC-131 FC131 AIDS-228435