(S (S (BASENP (PRP It)) (VP (VBZ is) (VP (VBN estimated) (SBAR (IN that) (S (BASENP (DT the) (NNP NOASC) (NN oil) (NNS sands)) (VP (VBP hold) (NP (BASENP (QP (RB approximately) (NN 2.2) (NN billion)) (NNS barrels)) (PP (IN of) (BASENP (NN oil) (NNS reserves)))))))))) (PERIOD .))