(S (S (BASENP (NNP OPEC)) (VP (VBZ has) (VP (VBN agreed) (SBAR (IN that) (S (PP (IN by) (NP (BASENP (NNP November) (NN 1)) (COMMA ,) (BASENP (NN 2007)))) (COMMA ,) (S (BASENP (PRP they)) (VP (MD will) (VP (VP (VB increase) (NP (BASENP (DT the) (NN amount)) (PP (IN of) (NP (BASENP (NNS barrels)) (PP (IN of) (NP (BASENP (NN oil)) (SBAR (S (BASENP (PRP they)) (VP (VBP produce)))))))))) (PP (IN by) (NP (BASENP (NN 500,000) (NNS barrels)) (BASENP (DT a) (NN day)))))))))))) (PERIOD .))