Multistep reaction;

1: N-Fmoc-D-Tyr(t-Bu)-OH With O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine TentaGel RRAM solid phase resin; 2: With piperidine in N,N-dimethyl-formamide T=50°C; 1 h; 3: N-(9-fluorenylmethoxycarbonyl)glycine; N-Fmoc-L-leucine; N-(9H-fluoren-9-ylmethyloxycarbonylamino)-L-alanine; Fmoc–Pro–OH; Fmoc-L-phenylalanine; N-(9-fluorenylmethoxycarbonyl)-L-aspartic acid-β-(tert-butyl)ester; Fmoc-O-trityl-l-threonine; fmoc-Asn(trt)-OH; fmoc-Gln(Trt)-OH; Nα-Fmoc-N(im)-trityl-L-histidine; Fmoc-Asp(OMpe)-OH; N-(9-fluorenyl)methoxycarbonyl-Trp(Boc)-OH; fmoc-L-Arg(Pbf)-OH Further stages;