11-(1-Methyl-4-piperidylidene)-6,11-dihydrodibenzo(b,e)thiepine-9-carboxylic acid HCl 138970-91-9 Dibenzo(b,e)thiepin-9-carboxylic acid, 6,11-dihydro-11-(1-methyl-4-piperidinylidene)-, hydrochloride VUFB 17,789