C4H8O

is the rough Formule several isomers:

the tetrahydro Furan , Number CASE 109-99-9
of the Aldehyde S:

the Butanal or butyraldéhyde , number CASE 123-72-8
the 2-methylpropanal or isobutyraldehyde , number CASE 78-84-2

the methyl éthyl ketone or MEC ( in MEK in English), developed formula {{chemical formula|C||H|3|C||H|2}} {{chemical formula|C||O||H}} {{chemical formula|C||H|3}}, number CASE 78-93-3
the cyclobutanol , number CASE 2919-23-5

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