(S (S (S (BASENP (NN Parthenolide)) (VP (VBZ appears) (S (VP (TO to) (VP (VB target) (NP (NP (BASENP (DT the) (NNS roots)) (PP (IN of) (BASENP (JJ myeloid) (NN leukemia)))) (COMMA ,) (BASENP (NN stem) (NNS cells)))))))) (COMMA ,) (SBAR (IN while) (S (NP (BASENP (JJ current) (NNS treatments)) (PP (VBG including) (BASENP (DT the) (ADJP (RB relatively) (JJ new)) (NN drug) (NNP Gleevec)))) (VP (VBP do) (RB n't))))) (PERIOD .))