(S (S (BASENP (DT The) (NNP FBI)) (VP (VBZ has) (VP (VBN confirmed) (SBAR (IN that) (S (NP (BASENP (DT the) (JJ chunky) (NN substance)) (VP (VP (VBN discovered) (PP (IN in) (NP (BASENP (DT the) (NNP Moore-Hill) (NN dormitory)) (PP (IN at) (NP (BASENP (DT the) (NNP University)) (PP (IN of) (BASENP (NNP Texas)))))))) (PP (IN on) (BASENP (NNP Thursday))))) (VP (VP (VBZ is) (RB not)) (BASENP (DT the) (NN poison) (NN ricin)))))))) (PERIOD .))