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Barca knew a victory in Denmark would guarantee themselves a place in the knock-out stages and the two-time reigning Spanish champions looked on course to achieve that after taking a 31st-minute lead through Lionel Messi.
However, second-placed FC Copenhagen went down the other end and drew level almost immediately through Claudemir to earn a share of the points - although they survived a big let-off in the final minute when Barca substitute Pedro Rodriguez hit the post.
Lyon scored three late goals but missed their chance to reach the last 16 with games to spare as Benfica boosted their own hopes of progressing from Group B with a thrilling 4-3 win.
The hosts began the night six points adrift of Lyon, but swept aside their French visitors in the early going with first-half goals from Alan Kardec, Fabio Coentrao and Javi Garcia.
Coentrao's second made it 4-0 midway through the second half before Lyon began their fightback. Jorge Carlos Martins provided the assist for all four Benfica goals.
Yoann Gourcuff got the first before Bafetimbi Gomis struck five minutes from time. Dejan Lovren headed home in the fifth minute of injury time, but the points went to Benfica.