The compounds of formulae IIA, the structure: ##STR1## wherein R.sub.1, R.sub.2, and X.sub.4, X.sub.5, n are as described in the specification.

Os compostos das fórmulas IIA, a estrutura: ## do ## STR1 wherein R.sub.1, R.sub.2, e X.sub.4, X.sub.5, n são como descritos na especificação.
 
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