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ethyl cinnamate
All acid groups are polar to greater or lesser degree, irrespective of what they are attached to.
Methyl cinnamate is the ester of cinnamic acid C6H5-CH=CH-COOCH3 but Methoxycinnamate is the pereaster of cinnamic acid, C6H5-CH=CH-COOOCH3.
An acetamidocinnamate is any acetamido derivative of a cinnamate, a salt or ester of cinnamic acid.
C6H5CH=CHCOOHhttp://en.wikipedia.org/wiki/Cinnamic_acid