5H-PYRIDO[3',4':4,5]PYRROLO[1,2,3-EF][1,5]BENZOXAZEPINE-11(8AH)-CARBOXYLIC ACID, 2-BROMO-6,7,9,10,12,12A-HEXAHYDRO-, 1,1-DIMETHYLETHYL ESTER, HYDROBROMIDE (1:1), (8AS,12AR)-