( ( ( Benzo ( -LRB- ( a -RRB- ) ) ) ( pyrene ( , ( or ( BaP , ) ) ) ) ) ( ( is ( one ( of ( ( a group ) ( of ( compounds ( called ( ( polycyclic ( aromatic hydrocarbons ) ) ( -LRB- ( PAHs -RRB- ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Benzo)) (PRN (-LRB- -LRB-) (X (SYM a)) (-RRB- -RRB-))) (ADJP (JJ pyrene) (, ,) (CC or) (JJ BaP) (, ,))) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (NNS compounds)) (VP (VBN called) (NP (NP (JJ polycyclic) (JJ aromatic) (NNS hydrocarbons)) (PRN (-LRB- -LRB-) (NP (NNP PAHs)) (-RRB- -RRB-)))))))))) (. .)))
Benzo(a)pyrene, or BaP, is one of a group of compounds called polycyclic aromatic hydrocarbons (PAHs).
(ROOT (S (NP (DT A) (NN lipid)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT a) (ADJP (RB highly) (JJ diverse)) (NN group)) (PP (IN of) (NP (NP (NNS compounds)) (VP (VBN made) (PRT (RP up)) (ADVP (RB mostly))))) (PP (IN of) (NP (NNS hydrocarbons))))))) (. .)))