Phthalaldehyde, also o-phthalaldehyde or ortho-phthalaldehyde or OPA, is the chemical compound with the formula C6H4(CHO)2. It is one of three isomers of benzene dicarbaldehyde. It is commonly used as a high-level disinfectant for medical instruments, as a polymerizer as well as in certain methods of wine making.
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