1-benzothiophen-2-ylmethanamine benzothiophen-2-ylmethanamine 2-benzothiophenylmethanamine benzothiophen-2-ylmethylamine 6314-43-8 Oprea1_824414 Oprea1_679404 SDCCGMLS-0065963.P001 ChemDiv2_001947 Benzo[b]thiophene-2-methylamine NSC40287 STK064350