The present invention relates to compounds represented by formula (I) (in the formula, R1 represents, e.g., a substituted or unsubstituted C1-6 alkyl group, R2 represents a group represented by Ra—CO—O—CRb2— or a group represented by RaO—CO—O—CRb2—, each Ra independently represents a substituted or unsubstituted C1-6 alkyl group, each Rb independently represents a hydrogen atom or a substituted or unsubstituted C1-6 alkyl group, R3 represents, e.g., a hydrogen atom, and Q represents, e.g., a substituted or unsubstituted phenyl group), or salts thereof, and herbicides comprising at least one selected therefrom as an effective component.