| http://www.w3.org/ns/prov#value | - atom, a methyl group, a methoxyl group or an ethoxyl group and R3 is a methyl, methoxyl or ethoxyl group, R1 represents an amino, C1-4 alkylamino, C2-4 alkylcarboxyamino, benzoylamino or phenylamino group bonded to the 6 or 7 position of the naphthalene ring and X denotes a hydrogen, sodium, potassium or lithium atom, with the proviso that Y and Z are different except when both R2 's are hydrogen
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