(S (S (NP (BASENP (NNP Dr.) (NNP Michael) (NNP Zimpfer)) (COMMA ,) (NP (BASENP (NN director)) (PP (IN of) (BASENP (DT the) (NNP Rudolfinerhaus) (NN clinic))))) (VP (VP (VBD emphasized) (BASENP (DT that) (NN time))) (SBAR (S (NP (EX there)) (VP (VP (VP (VBD was) (BASENP (DT no) (NN proof))) (ADVP (RB yet))) (SBAR (S (VP (TO to) (VP (VB specify) (NP (BASENP (DT the) (NN substance)) (VP (VBG causing) (BASENP (DT the) (NN illness))))))))))))) (PERIOD .))