68857-04-5 84255-86-7 Cyclic(L-leucyl-L-prolyl-L-leucyl-O-methyl-D-tyrosyl) Cyclo(D-tyr(Me)-L-ile-L-pro-D-leu) Cyclo(D-tyr(Me)-L-ile-L-pro-L-leu) Cyclo(Me-tyr-ile-pro-leu) Cyclo(methyltyrosyl-isoleucyl-prolyl-leucyl) Cyclo(tiprl)