Biological Activity
LP 12 dihydrochloride is a 5-HT7 receptor agonist displaying selectivity over D2, 5-HT1A and 5-HT2A receptors (Ki values are 0.13, 224, 60.9 and 1464 nM, respectively. It also displays selectivity over D2, 1723; over 5-HT1A, 468; over 5-HT2A, 11261; and high potency. Sigma has added LP 44 (L9793) which shows significantly lower D2 selectivity (7.3 nM/0.22 nM for 33-fold), lower selectivity over 5-HT1A, 240; and over 5-HT2A, 1482. LP 12 and LP 44 seem to share a common intermediate.