INTERMEDIATES   Iminodibenzyl 3-Chloro iminodibenzyl Dibenzosuberone Benzpthalide 2, 8 Dibromo Suberone Doxepinone Dothiepinone Ritodrine intermediates Dibenzosubarene Dibenzosuberylamine Dibenzosuberenone 2-Piperidinoethylchloride hydrochloride 3-Dimethylaminopropyl chloride Hydrochloride 2-Methyl-3-Dimethylamino propyl chloride