( Bromelain ( ( has ( ( very low ) toxicity ) ) . ) )
(ROOT (S (NP (NNP Bromelain)) (VP (VBZ has) (NP (ADJP (RB very) (JJ low)) (NN toxicity))) (. .)))
Bromelain has very low toxicity.
(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))) (. .)))