A series of 30 RCO-HfR-NH(2) derivatives show preference for the mouse MC1R vs MC3-5Rs. trans-4-HOC(6)H(4)CH=CHCO-HfR-NH(2) (13) [EC(50) (nM): MC1R 83, MC3R 20500, MC4R 18130 and MC5R 935; ratio 1:246:217:11] is 11 times more potent than the lead compound LK-394 Ph(CH(2))(3)CO-HfR-NH(2) (2) and only 11 times less potent than the native tridecapeptide alpha-MSH at mMC1R. Differences in conformations of 2 and 13 are discussed.
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| http://dx.doi.org/10.1016/j.bmcl.2009.07.025 | DOI Listing |
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