| http://www.w3.org/ns/prov#value | - The compounds of formula (I') wherein R2 is acyloxyalkanoyl can be synthesized by reacting a compound of the formula: ##STR17## wherein p is a integer of 1 to 4 and other symbols are as defined above, with a metal (e.g. sodium, potassium, lithium) salt of a compound of the formula (VII).
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