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Fmoc-tyr(et)-oh

Boc-n-me-d-tyr-oh

Fmoc-n-me-tyr(tbu)-oh

H-d-pro-otbuhcl

Boc-d-asn(trt)-oh

Boc-d-gln(trt)-oh

H-d-lys(boc)-otbu hcl

Boc-d-orn(boc)-oh