158798-83-5 AK 275 AK-275 Butanamide, N-((phenylmethoxy)carbonyl)-L-leucyl-N-ethyl-L-2-amino- CX 275 N-((Phenylmethoxy)carbonyl)-L-leucyl-N-ethyl-L-2-aminobutanamide Z-Leu-abu-conh-CH2CH3