( ( The ( most ( common contaminants ) ) ) ( ( are ( ( ( ( ( ( ( salts , ) ( bacterial proteins ) ) , ) ( cell ( wall carbohydrates ) ) ) , ) and ) ( ( organic solvants ) ( -LRB- ( ( ethanol ( , ( ( propanol , ) etc. ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (RBS most) (JJ common) (NNS contaminants)) (VP (VBP are) (NP (NP (NNS salts)) (, ,) (NP (JJ bacterial) (NNS proteins)) (, ,) (NP (NN cell) (NN wall) (NNS carbohydrates)) (, ,) (CC and) (NP (NP (JJ organic) (NNS solvants)) (PRN (-LRB- -LRB-) (NP (NNS ethanol) (, ,) (NNS propanol) (, ,) (FW etc.)) (-RRB- -RRB-))))) (. .)))
The most common contaminants are salts, bacterial proteins, cell wall carbohydrates, and organic solvants (ethanol, propanol, etc.).
(ROOT (S (NP (NNS Carbohydrates)) (VP (VBP are) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN type)) (PP (IN of) (NP (JJ organic) (NN compound))))) (. .)))