Patent ID: 8729115

Claim:
A compound of formula (IA) or (IB) or a mixture thereof, wherein A is —(C═O)—NR 2 —(CH) d —O—X; —CH 2 —O—(C═O)—NR 2 —(CH) d —O—X; or —CH 2 —O—(C═O)—O—(CH) d —O—X; B is —(CH 2 ) b —O—X; X is NO 2 or N═(NO)—R 3 ; R 1 is methyl or ethyl; R 2 is H, methyl or ethyl; R 3 is diethylamino, pyrrolidino or piperidino; b is between 1 and 6; and d is between 1 and 4.