Jilek, J: Tricyclic analogues of the antiallergic agent oxatomide: 1-(3-(4-(10,11-dihydro-5h-dibenzo(a,d)-cycloheptene-5-yl)-1-piperazinyl)propyl)-1,3-dihydro-2h-benzimidazol-2-one and the related 6,11-dihydrodibenzo-(b,e)thiepin,|4,9-dihydrothieno(2,3-c)-2-benzothiepin, and 10,11-dihydrodibenzo(b,f)thiepin derivatives