meta cresol meta-cresol, also 3-methylphenol, is an organic compound with the formula ch3c6h4(oh). It is a colourless, viscous liquid that is an intermediate in the production of other chemicals. It is a derivative of phenol and is an isomer of p-cresol and o-cresol.[3] cas registry number: 108-39-4 chemical formula : c7h8oappearance : colorless liquid to yellowish liquid