( ( ( ( F , ) ( the ( wood alcohol ) ) ) ( -LRB- ( ( used ( to ( excrete ( the chemicals ) ) ) ) -RRB- ) ) ) ( ( ( converts ( ( ( ( to formaldehyde ) and ) then ) ( to ( ( ( formic acid ) , ) ( which ( ( in turn ) ( causes ( metabolic acidosis ) ) ) ) ) ) ) ) ( -LRB- ( ( ( formic acid ) ( is ( ( the poison ) ( found ( in ( ( the sting ) ( of ( fire ants ) ) ) ) ) ) ) ) -RRB- ) ) ) . ) )
(ROOT (S (NP (NP (NN F)) (, ,) (NP (DT the) (NN wood) (NN alcohol)) (PRN (-LRB- -LRB-) (VP (VBN used) (S (VP (TO to) (VP (VB excrete) (NP (DT the) (NNS chemicals)))))) (-RRB- -RRB-))) (VP (VBZ converts) (PP (PP (TO to) (NP (NN formaldehyde))) (CC and) (RB then) (PP (TO to) (NP (NP (JJ formic) (NN acid)) (, ,) (SBAR (WHNP (WDT which)) (S (PP (IN in) (NP (NN turn))) (VP (VBZ causes) (NP (JJ metabolic) (NNS acidosis)))))))) (PRN (-LRB- -LRB-) (S (NP (JJ formic) (NN acid)) (VP (VBZ is) (NP (NP (DT the) (NN poison)) (VP (VBN found) (PP (IN in) (NP (NP (DT the) (NN sting)) (PP (IN of) (NP (NN fire) (NNS ants))))))))) (-RRB- -RRB-))) (. .)))
F, the wood alcohol (used to excrete the chemicals) converts to formaldehyde and then to formic acid, which in turn causes metabolic acidosis (formic acid is the poison found in the sting of fire ants).
(ROOT (S (NP (JJ Formic) (NN acid)) (VP (VBZ is) (VP (VBN found) (PP (IN in) (NP (NP (DT the) (NNS secretions)) (PP (IN of) (NP (JJ stinging) (NNS ants))))))) (. .)))