Patent ID: 6855696

Claim:
A compound of formula (I): wherein R 1 is CH 2 -[sulfur-linked-cysteine]-R x ; R 2 is methyl; R 3 is hydrogen; R 4 is methyl; R 5 is hydroxy; and R 6 is methyl; wherein R x is a is -Leu-Leu-Leu, -Leu-Phe-Leu, -Leu-Gly-Leu, -Leu-Leu-Phe, -Leu-Phe-Phe, -Leu-Gly-Phe, -Leu-Leu-Gly, -Leu-Phe-Gly, -Leu-GIy-Gly, -Phe-Leu-Leu, -Phe-Phe-Leu, -Phe-Gly-Leu, -Gly-Leu-Leu, -Gly-Phe-Leu, -Gly-Gly-Leu, -Leu-Leu, -Phe-Leu, -Gly-Leu, -Lcu-Leu-Phe, -Phe-Phe-Phe, -Phe-Gly-Phe, -Gly-Leu-Phe, -Gly-Phe-Phe, -Gly-Gly-Phe, -Leu-Phe, -Phe-Phe, -Gly-Phe, -Phe-Leu-Gly, -Phe-Phe-Gly, -Phe-Gly-Gly, -Phe-Leu-Gly, -Gly-Phe-Gly, -Gly-Gly-Gly, -Leu-Gly, -Phe-Gly, or -Gly-Gly; or a pharmaceutically acceptable salt thereof.