[Summary]
[Problem] Provision of a novel compound which is easily-soluble in isopropyl acetate superior in liquid-separation operability, and can be used for a production method of peptide and the like, that provides a final product simply by extraction-layer-separating, without crystallization and isolation of each intermediate in each step.
[Solving Means] It has been found that the above-mentioned problems can be solved by a particular branched chain-containing aromatic compound.