PROBLEM TO BE SOLVED: To provide a new MEL.SOLUTION: The present invention provides a monoacyl MEL having a structure of the following formula (1) (where R1 is a C2-24 aliphatic acyl group. R2, R3 and R4 independently represent a hydrogen atom or an acetyl group).SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】新たなMELを提供すること。【解決手段】下記式(1)の構造を有するモノアシル型MEL。 (式中、R1は炭素数2~24の脂肪族アシル基を表す。R2、R3及びR4は各々独立して水素原子又はアセチル基を表す。)【選択図】なし