New compounds have been synthesized based on the structure of the anti-tumoral drug tamoxifen and its diphenylmethane derivative, N, N-diethyl-2-[(4-phenyl-methyl)-phenoxy]- ethanamine, HCl (DPPE). These new compounds have no affinity for the estrogen receptor (ER) and bind with various affinity to the anti-estrogen binding site (AEBS). Compounds 2, 10, 12, 13, 20a, 20b, 23a, 23b, 29 exhibited 1.1–69.5 higher affinity than DPPE, and ...