NEW MATERIAL:A compound expressed by formula I (R1 is formula II or III; R2 is formula IV or II).

EXAMPLE: 11-O-[{4-O-Isobutyryl-α-L-rhamnopyranosyl}(1→4)--{3-O-methylbutyl-α-L- rhamnopyranosyl}(1→4)-α-L-rhamnopyranosyl(1→4)-α-L-rhamnopyranosyl]-1,3"-11 R-jalapinololactone.

USE: A remedy for diabetes effective in treating hemoptysis by tuberculous diseases.

PREPARATION: A fresh tuberous root of Merremia mammosa of the family convolvulaceae is macerated and extracted with methanol to provide a methanol extract essence, which is partitioned with chloroform/water to separate and purify a portion passed into the chloroform by column chromatography, etc.