( ( The ( antimalarial drugs ) ) ( ( ( ( scored well ) , ) ( ( ( mainly due ) ( to ( ( relatively low ) toxicity ) ) ) ( rather ( than ( very ( high efficacy ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ antimalarial) (NNS drugs)) (VP (VBD scored) (ADVP (RB well)) (, ,) (S (ADJP (ADJP (RB mainly) (JJ due)) (PP (TO to) (NP (ADJP (RB relatively) (JJ low)) (NN toxicity))) (PP (RB rather) (IN than) (ADJP (RB very) (JJ high) (RB efficacy)))))) (. .)))
The antimalarial drugs scored well, mainly due to relatively low toxicity rather than very high efficacy.
(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))) (. .)))