( ( ( ( ( ( ( ( ( Health ( Effects ( Naphthalene 's ) ) ) ( characteristic tar ) ) or ) ( mothball-like odor ) ) ( is ( ( a ( good warning ) ) ( of ( its presence ) ) ) ) ) , ) but ) ( ( like ( ( its odor ) ( in ( a ( home ( clothes closet ) ) ) ) ) ) ( , ( ( ( the odor ) ( from ( coal ( chemicals processing ) ) ) ) ( ( ( does not ) necessarily ) ( mean danger ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NP (NNP Health) (NNPS Effects) (NNP Naphthalene) (POS 's)) (JJ characteristic) (NN tar)) (CC or) (NP (JJ mothball-like) (NN odor))) (VP (VBZ is) (NP (NP (DT a) (JJ good) (NN warning)) (PP (IN of) (NP (PRP$ its) (NN presence)))))) (, ,) (CC but) (S (PP (IN like) (NP (NP (PRP$ its) (NN odor)) (PP (IN in) (NP (DT a) (NN home) (NNS clothes) (NN closet))))) (, ,) (NP (NP (DT the) (NN odor)) (PP (IN from) (NP (NN coal) (NNS chemicals) (NN processing)))) (VP (VBZ does) (RB not) (ADVP (RB necessarily)) (VP (VB mean) (NP (NN danger))))) (. .)))
Health Effects Naphthalene's characteristic tar or mothball-like odor is a good warning of its presence, but like its odor in a home clothes closet, the odor from coal chemicals processing does not necessarily mean danger.
(ROOT (S (NP (NNS Naphthalens)) (VP (VBZ is) (NP (NP (DT a) (NN chemical)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN used) (PP (IN in) (NP (NNS mothballs))))))))) (. .)))