proceeds as in scheme ii above and provides a compound named 5 2 aminoethyl amino 2 2 diethylamino ethyl 2h 1 benzothiopyrano 4 3 2 cd indazol 9 ol trihydrochloride preferably the compound is 5 2 aminoethyl amino 2 2 diethylamino ethyl 2h benzothiopyrano 4 3 2 cd indazol 8 ol trihydrochloride or 5 2 aminoethyl amino 2 2 diethylamino ethyl 2h benzothropyrano 4 3 2 cd indazole 9 ol trihydrochloride examples 1 2 and 3 illustrate the process in steps a b and c examples 4 5 and 6 illustrate the process in steps d e and f examples 7 19 are meant to be illustrative of the present invention these examples are presented to exemplify the invention and are not to be construed as limiting the scope of the invention a solution of 441 4 g 1 0 mol of 5 amino n n diethyl 8 methoxy 2h 1 benzothiopyrano 4 3 2 cd indazole 2 ethanamine dihydrochloride 1 u s pat no 4 604 390 in 8 9 l of water was adjusted to ph 10 with 2 5 l of 2n aqueous sodium hydroxide the precipitated free base was extracted into 52 l of dichloromethane the organic phase was washed.