An object of the present invention provide a sweetness that exerts a sweetness that is sustainable in the slow-acting . A octenyl sulfuric ester or a salt thereof represented by the following formula ( 1 ) (wherein the wavy line indicates either cis or trans configuration ) . [ Selection Figure ] None【課題】遅効性で持続性のある甘味を発揮する甘味質の提供。【解決手段】下記式(1)で示されるオクテニル硫酸エステル又はその塩(式中、波線はシス又はトランス配置のいずれかを示す)。【選択図】なし