{HEAD ~ Novel 1,2 dimethylene} substituted {TAIL ~ cyclic esters}, their substitution products, derivatives, particularly polymers thereof, as well as methods for preparing these compounds are provided 
substituted
{ HEAD ~ Novel 1,2 dimethylene } substituted { TAIL ~ cyclic esters } , their substitution products , derivatives , particularly polymers thereof , as well as methods for preparing these compounds are provided
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