(S (S (SBAR (WHADVP (WRB When)) (S (BASENP (NNP Yushchenko)) (VP (VP (VBD fell) (ADJP (JJ ill))) (PP (IN on) (BASENP (NNP October) (NN 6th)))))) (COMMA ,) (S (BASENP (JJ Ukrainian) (NNS doctors)) (VP (VBD had) (VP (ADVP (RB initially)) (VP (VP (VBN diagnosed) (BASENP (NN food) (NN poisoning))) (COMMA ,) (S (VP (VBG leading) (PP (TO to) (NP (NN speculation) (SBAR (IN that) (S (BASENP (PRP he)) (VP (VBD had) (VP (VBN been) (VP (VBN poisoned) (ADVP (RB deliberately)))))))))))))))) (PERIOD .))