Novel compound isolated from quamoclit, and composition for preventing or treating diabetes containing the compound as an active ingredient

A pharmaceutical composition for preventing or treating diabetes and its complications, which contains a compound of chemical formula 1;

• salt thereof;
• or extract comprising a compound of chemical formula 1 or salt thereof, as an active ingredient:
• wherein R1 and R2 are independently hydrogen, C1-20 alkyl group, C6-30 aryl group, C1-20 allyl group, C6-30 arylalkyl group or acyl group.

A health functional food for preventing diabetes and its complications, which contains a compound of chemical formula 1;

• salt thereof;
• or extract comprising a compound of formula 1 or salt thereof, as an active ingredient:
• wherein R1 and R2 are independently hydrogen, C1-20 alkyl group, C6-30 aryl group, C1-20 allyl group, C6-30 arylalkyl group or acyl group.