prov:value
| - r 3,n denotes number 1 or 2,p is the number 0, 1 or 2,R.sup.5 is a hydrogen atom, a sulfo group, an alkyl group of 1 to 4 carbon atoms, such as the ethyl group and in particular the methyl group, an alkoxy group of 1 to 4 carbon atoms, such as the ethoxy group and in particular methoxy group, achlorine atom or a bromine atom,R.sup.6 denotes a hydrogen atom, a sulfo group, an alkyl group of 1 to 4
|