125989-10-8 Cyclo(gln-trp-phe-gly(anc-2)-leu-met) L 659837 L-659,837 L-Phenylalanine, N-(2-(3-amino-2-oxo-1-pyrrolidinyl)-4-methyl-1-oxopentyl)-L-methionyl-L-glutaminyl-L-tryptophyl-, cyclic (4-1)-peptide, (S-(R*,S*))-