( ( An ( acid anhydride ) ) ( ( is ( ( a compound ) ( that ( has ( ( two ( acyl groups ) ) ( bonded ( to ( the ( same ( oxygen atom ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (JJ acid) (NN anhydride)) (VP (VBZ is) (NP (NP (DT a) (NN compound)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (NP (CD two) (JJ acyl) (NNS groups)) (VP (VBN bonded) (PP (TO to) (NP (DT the) (JJ same) (NN oxygen) (NN atom)))))))))) (. .)))
An acid anhydride is a compound that has two acyl groups bonded to the same oxygen atom.
(ROOT (S (NP (DT An) (NN ether)) (VP (VBZ is) (NP (NP (DT an) (JJ organic) (NN compound)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (NN hydrocarbon) (NNS groups)) (VP (VBP are) (VP (VBG bonded) (PP (TO to) (NP (DT the) (JJ same) (NN oxygen) (NN atom))))))))) (. .)))