(S (S (BASENP (PRPD His) (NNS experiments)) (VP (ADVP (RB reportedly)) (VP (VBD included) (S (S (VP (VP (VP (VBG operating) (PP (IN on) (BASENP (DT a) (NN patient)))) (PP (IN without) (BASENP (NN anesthetic)))) (S (VP (TO to) (VP (VB see) (SBAR (WHNP (WHADJP (WRB how) (JJ much)) (NN pain)) (S (BASENP (DT a) (JJ human) (NN being)) (VP (MD could) (VP (VB endure)))))))))) (CONJP (COMMA ,) (CC and)) (S (VP (VP (VP (VBG injecting) (BASENP (NN petrol))) (PP (IN into) (BASENP (DT the) (NN bloodstream)))) (CONJP (COMMA ,) (RB then)) (VP (VB timing) (SBAR (WHNP (WRB how) (JJ long)) (S (BASENP (PRP it)) (VP (VBD took) (SBAR (IN for) (S (BASENP (DT the) (NN victim)) (VP (TO to) (VP (VB die))))))))))))))) (PERIOD .))