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Ulster came from behind to beat Montpellier in the last 16 of the European Challenge Cup after the French side had Paul Willemse sent off and were shown three second-half cards.
La Rochelle slumped to a 42-31 defeat against Montpellier in the Top 14 on Saturday, just a week before they meet Leinster in the Champions Cup final, while Brive were relegated.
Ospreys captain Justin Tipuric believes winning away in Montpellier in the Heineken Champions Cup was one of their "best" triumphs in Europe.