Patent ID: 7285666

Claim:
A compound represented by the general formula, a salt of the compound or a thereof, wherein R 7a represents a hydrogen, nitro, —NO or —NHR 7d wherein R 7d represents a hydrogen, t-butoxycarbonyl or benzyloxycarbonyl; R 7c represents methylene, oxygen or sulfur; and R 7b represents a halogen, the formula: wherein R 8a and R 8b each independently represents a hydrogen or C 1-6 alkyl, or R 8a and R 8b optionally bond together to form 1,2-ethylene, 1,3-propylene or 2,3-dimethylbutan-2,3-diyl, the formula: wherein R 8c , R 8d and R 8e each independently represent C 1-6 alkyl or the formula: wherein R 40 and R 41 each independently represents methoxy, ethoxy, ethyl, dimethylamino, methyl or halogen, R 42 represents hydrogen, methoxy, methyl or halogen, and Z 1 and Z 2 each independently represent methine or nitrogen.