N-tert-butyloxycarbonyl-O-benzyl-L-tyrosyl-L-prolyl-L-phenylalanyl-L-prolylglycine

tert-butyl N-tert-butyloxycarbonyl-L-prolyl-L-phenylalanyl-L-prolylglycyl-L-prolyl-L-isoleucinate

N-tert-butyloxycarbonyl-O-benzyl-L-tyrosyl-L-prolyl-L-phenylalanyl-L-prolylglycyl-L-prolyl-L-isoleucine

(吡咯烷-2-羰基)-氨基-乙酸