( ( ( Essential ( Organic Compounds ) ) ( -LRB- ( ( ( ( carbohydrates ( , ( ( lipids , ) protein ) ) ) , ) ( nucleic acids ) ) -RRB- ) ) ) . )
(ROOT (NP (NP (NNP Essential) (NNP Organic) (NNP Compounds)) (PRN (-LRB- -LRB-) (NP (NNS carbohydrates) (, ,) (NNS lipids) (, ,) (FW protein)) (, ,) (NP (JJ nucleic) (NNS acids)) (-RRB- -RRB-)) (. .)))
Essential Organic Compounds (carbohydrates, lipids, protein, nucleic acids).
(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))))) (. .)))