(S (S (NP (BASENP (DT A) (NN compound)) (PP (IN in) (BASENP (DT the) (JJ common) (JJ daisy-like) (NN plant) (NN feverfew)))) (VP (VP (VBZ kills) (BASENP (JJ human) (NN leukemia) (NN stem) (NNS cells))) (CC and) (VP (MD could) (VP (VB form) (NP (BASENP (DT the) (NN basis)) (PP (IN for) (NP (NP (ADJP (ADJP (JJR newer)) (COMMA ,) (ADJP (RBR more) (JJ effective))) (NNS drugs)) (PP (IN for) (BASENP (DT the) (NN disease)))))))))) (PERIOD .))