Patent ID: 7241783

Claim:
A compound selected from: 4-(naphth-1-yl)-1-(2,4,6-trihydroxybenzylidene)-3-thiosemicarbazide; 1-[(2-hydroxynaphth-1-yl)methylidene]-4-(4-sulfophenyl)-3-thiosemicarbazide; 1-[1-(4-carboxy-2-hydroxyphenyl)ethylidene]-4-(naphth-1-yl)-3-thiosemicarbazide; 4-(4-carboxyphenyl)-1-[(2-hydroxynaphth-1-yl)methylidene]-3-thiosemicarbazide; 4-(3-carboxyphenyl)-1-[(2-hydroxynaphth-1-yl)methylidene]-3-thiosemicarbazide; 1-(4-carboxy-2-hydroxybenzylidene)-4-(naphth-1-yl)-3-thiosemicarbazide; 4-(4-carboxyphenyl)-1-[(1-hydroxynaphth-2-yl)methylidene]-3-thiosemicarbazide; 4-(3-carboxyphenyl)-1-[(1-hydroxynaphth-2-yl)methylidene]-3-thiosemicarbazide; 1-(2,4-dihydroxybenzylidene)-4-(naphth-1-yl)-3-thiosemicarbazide; 4-(4-carboxyphenyl)-1-[2-hydroxy-3-(naphth-1-yl)benzylidene]-3-thiosemicarbazide; and 4-(3-carboxyphenyl)-1-[2-hydroxy-3-(naphth-1-yl)benzylidene]-3-thiosemicarbazide.