A1IFK a1ifk tert-butyl 4-[2-[[(2S)-1-[[(2S)-1-[[(1S)-2-cyclohexyl-1-[(2R,3S,6R,7S)-3-methanoyl-2,6-dimethyl-6,7-bis(oxidanyl)-1,4-oxazepan-7-yl]ethyl]amino]-3-(4-methoxyphenyl)-1-oxidanylidene-propan-2-yl]amino]-1-oxidanylidene-3-phenylmethoxy-propan-2-yl]amino]-2-oxidanylidene-ethyl]piperazine-1-carboxylate A1IFK