hubieran anulado
Past perfect subjunctive ellos/ellas/ustedes conjugation of anular.

anular

De hecho, esto significaba que aun en el caso de que las ventajas para la India se hubieran anulado o menoscabado, la cadena causal entre las medidas en litigio y la anulación y el menoscabo se habría roto al rechazar la India la oportunidad de negociar ajustes.
This meant in effect that, even if India's benefits were nullified or impaired, the chain of causation between the measures challenged and the nullification and impairment would be broken by India's rejection of the opportunity to negotiate adjustments.
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