prov:value
| - The removal of the tetrahydropyranyl group from the compound of the formula (IX) can be achieved by using an acid in a solvent, for example, aromatic hydrocarbons such as benzene, toluene, xylene and the like, n-hexane, cyclohexane, ethers such as diethyl ether, 1,2-dimethoxyethane, dioxane and the like, hydrated solvents for example, alcohols such as methanol, ethanol, propanol and the like, chlo
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