( ( An acetal ) ( ( has ( ( two ( ether functions ) ) ( at ( a ( single ( carbon atom ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN acetal)) (VP (VBZ has) (NP (NP (CD two) (NN ether) (NNS functions)) (PP (IN at) (NP (DT a) (JJ single) (NN carbon) (NN atom))))) (. .)))
An acetal has two ether functions at a single carbon atom.
(ROOT (S (NP (NNS Ethers)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NP (DT an) (NN oxygen) (NN atom)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (NP (JJ single) (NNS bonds)) (PP (IN with) (NP (CD two) (NN carbon) (NNS atoms)))))))))) (. .)))