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Mesitylene or 1,3,5-trimethylbenzene is a derivative of benzene with three methyl substituents positioned symmetrically around the ring. There are many reported cases of the toxic poisoning from mesitylene. It is also used as an insecticide, an anti-coagulant, a disinfectant, an anti-inflammatory agent and as a pesticide and it is quite harmful if ingested or absorbed through the skin. So, it is quite useful for medicinal chemistry although the therapeutic activity has not been established.

Hydroxypropyl methylcellulose (HPMC) has a place with the gathering of cellulose ethers wherein hydroxyl bunches have been subbed with at least one of the three hydroxyl bunches present in the cellulose ring