Table 1. Receptor affinity and activity of ifenprodil and tetrahydro-3-benzazepines 1-5. n.d. = not determined; ^$The given IC₅₀ values result from measurements of 18 - 30 oocytes, respectively; ^#Due to low GluN2B inhibitory activity, the inhibition (in % ± SEM) at a test compound concentration of 30 µM is given