an improved synthesis of a fully protected hexadecapeptide bpoc-cys ( trt ) -cys- ( trt ) -thr ( but ) -ser ( but ) -ile-cys ( trt ) -ser ( but ) -leu-tyr ( but ) -gln -leu-glu ( obut ) -asn-tyr ( but ) -cys ( trt ) -asn-obut , which corresponds to the amino acid sequence 71-86 of human proinsulin , is described .
C0017797
gln
C0061472
glu