| http://www.w3.org/ns/prov#value | - A compound of formula I: ##STR16## wherein R1 is hydrogen, alkali or alkaline earth metal or organic base salts;R2 is i) hydrogen; alkali or alkaline metal salt; organic base salt; C1 -C6 hydrocarbyl;ii) --RUp wherein R is C1 -C6 hydrocarbyl, U is halogen and p is an integer which cannot exceed the number of hydrogen atoms of the completely hydrogenated hydrocarbyl moiety; iii) --ROR8 wherein R is
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