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