Medchemexpress, HY-103104 5mg Fananserin CAS:127625-29-0 Fananserin (RP 62203) is an orally bioavailable, potent and selective 5-hydroxytryptamine2 (5-HT2) receptor antagonist, with a Ki of 0.37 nM for the rat 5-HT2A receptor. Fananserin also is a selective dopamine D4 receptor antagonist, with a Ki of 2.93 nM for the human dopamine D4 receptor. Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.