Compounds of Formula I ##STR1## Wherein Z2 is an Oxygen or a Sulfur, Z1 is --CH.dbd.CH-- and Y is a bond, W1 and W2 are hydrogens and X1 and X2 are various heterocyclic rings are disclosed.

Os compostos do ## wherein Z2 é um oxigênio ou um enxôfre, Z1 do ## STR1 da fórmula I são -- CH.dbd.CH -- e Y é uma ligação, W1 e W2 são hydrogens e X1 e X2 são vários anéis heterocyclic são divulgados.

 
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