Patent ID: 8703800

Claim:
A compound of formula wherein R 1 is —(CH 2 CH 2 O) a X, —(CH 2 ) b OX or —(CH 2 ) c CH[(CH 2 ) d OX] 2 ; R 2 is hydrogen, methyl, ethyl, —(CH 2 CH 2 O) a X, —(CH 2 ) b OX or —CH 2 O(C═O)NH(CH 2 CH 2 O) a X; X is NO 2 or N═(NO)—R 3 ; R 3 is di(C 1 -C 18 -alkyl)amino, di(2-aminoethyl)amino, N-2-aminoethyl-N-2-hydroxyethyl-amino, pyrrolidino, piperidino, piperazino, 4-(C 1 -C 4 -alkyl)piperazino, 4-phenylpiperazino, 4-(2-pyridyl)piperazino or morpholino; a is 1, 2 or 3; b is between 1 and 6; c is 1 or 2; d is between 1 and 4; and pharmaceutically acceptable salts thereof.