(D-Pen2,D-Pen5)-Enkephalin 1,2-Dithia-5,8,11-triazacyclotetradecane, cyclic peptide deriv. 1,2-dithia-5,8,11-triazacyclotetradecane-4-carboxylic acid, 13-[[(2S)-2-amino-3-(4-hydroxyphenyl)-1-oxopropyl]amino]-3,3,14,14-tetramethyl-6,9,12-trioxo-7-(phenylmethyl)-, (4S,7S,13S)- 88373-73-3 Cyclic [D-Pen2, D-Pen5]enkephalin Cyclic(D-penicillamine2,5)enkephalin D-Valine, L-tyrosyl-3-mercapto-D-valylglycyl-L-phenylalanyl-3- mercapto-, cyclic (2-5)-disulfide D-Valine, L-tyrosyl-3-mercapto-D-valylglycyl-L-phenylalanyl-3-mercapto-, cyclic (2