Abstract: The invention provides a chroman derivative represented by the following Formula (I) that enables the production of an SMTP compound having a desired structure: wherein, in Formula (I), each of Y1 and Y2 independently represents a hydrogen atom, a hydroxy group, an alkoxy group, an aryloxy group, or a halogen atom; each of R1 and R2 independently represents a hydrogen atom, an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a carbamoyl group; L represents an aliphatic hydrocarbon group having from 4 to 10 carbon atoms; each X independently represents a hydroxy group or a carboxy group; and n represents an integer from 0 to 2.

Abstract: The invention provides a chroman derivative represented by the following Formula (I) that enables the production of an SMTP compound having a desired structure: wherein, in Formula (I), each of Y1 and Y2 independently represents a hydrogen atom, a hydroxy group, an alkoxy group, an aryloxy group, or a halogen atom; each of R1 and R2 independently represents a hydrogen atom, an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a carbamoyl group; L represents an aliphatic hydrocarbon group having from 4 to 10 carbon atoms; each X independently represents a hydroxy group or a carboxy group; and n represents an integer from 0 to 2.