Indoles 11 and 12 (R 1 and/or R 2 = NHCH 3 or H; R and R 3 = NH 2 or H) were examined to determine the influence of amine substituents on 5-HT 6 receptor affinity. Although all compounds displayed low nanomolar affinity, only a single aryl amine moiety is required for binding. It appears that multiple modes of binding are possible upon interaction of these types of compounds with 5-HT 6 receptors. ... 5-HT 6 receptors represent one of seven (5-HT 1 –5-HT 7 ) major ...