History of acute renal failure.
 The patient had a nephrotoxic medication. 
(ROOT (NP (NP (NP (NN History)) (PP (IN of) (NP (JJ acute) (JJ renal) (NN failure)))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBD had) (NP (DT a) (JJ nephrotoxic) (NN medication))) (. .)))
( ( History ( of ( acute ( renal failure ) ) ) ) . )
( ( The patient ) ( ( had ( a ( nephrotoxic medication ) ) ) . ) )