( ( ( An ( important advantage ) ) ( of ( ( the use ) ( of Gentrol ) ) ) ) ( ( is ( that ( hydroprene ( ( has ( ( very low ) toxicity ) ) ( to mammals ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (JJ important) (NN advantage)) (PP (IN of) (NP (NP (DT the) (NN use)) (PP (IN of) (NP (NNP Gentrol)))))) (VP (VBZ is) (SBAR (IN that) (S (NP (NN hydroprene)) (VP (VBZ has) (NP (ADJP (RB very) (JJ low)) (NN toxicity)) (PP (TO to) (NP (NNS mammals))))))) (. .)))
An important advantage of the use of Gentrol is that hydroprene has very low toxicity to mammals.
(ROOT (S (NP (NP (DT The) (JJ main) (NN advantage)) (PP (IN of) (NP (NN urea)))) (VP (VBZ is) (NP (PRP$ its) (ADJP (RB very) (JJ low)) (NN toxicity))) (. .)))