A compound represented by the structure of formula III: wherein Z is carbon, nitrogen, phosphorus, arsenic, silicon or germanium; R', R" and R'" are independently the same or different comprising hydrogen, alkyl, haloalkyl, alkylamino, phenyl, benzyl, alkanyloyl, acetyl or benzoyl; R 1, R 3, R 4, R 6, R 7 and R 9 are the same or different, H, D, OH, halogen, nitro, CN, nitrileamido, amidosulfide, amino, aldehyde, substituted ketone, -COOH, ester, trifluoromethyl, amide, substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, arylalkyl, alkylaryl, arylsulfonyl, arylalkylenesulfonyl, alkoxy, alkylalkoxy, haloalkyl, alkylhaloalkyl, haloaryl, aryloxy, amino, monoalkylamino, dialkylamino, alkylamido, arylamino, arylamido. alkylthio, arylthio, heterocycloalkyl, alkylheterocycloalkyl, heterocycloalkylalkyl, heteroaryl, heteroarylalkyl, alkylheteroaryl; or R 3, R 4, or R 7, forms a fused cycloalkyl, heterocycloalkyl, aromatic or heteroaromatic ring with the main aromatic ring; and R 10 is nothing, H, D, OH, halogen, oxo, nitro, CN, nitrileamido, amidosulfide, amino, aldehyde, substituted ketone, -COOH, ester, trifluoromethyl, amide, substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, arylalkyl, alkylaryl, arylsulfonyl, arylalkylenesulfonyl, alkoxy, haloalkyl, haloaryl, cycloalkyl, alkylcycloalkyl, aryloxy, monoalkylamino, dialkylamino, alkylamido, arylamino, arylamido, alkylthio, arylthio, heterocycloalkyl, alkylheterocycloalkyl, heterocycloalkylalkyl, heteroaryl, heteroarylalkyl, alkylheteroaryl; or its isomer, pharmaceutically acceptable salt, pharmaceutical product, hydrate, N-oxide, crystal or any combination thereof, wherein the compound can activate or enhance telomerase expression or activity, for use in stimulating or increasing pancreatic beta-cell mass in a diabetic subject in need thereof Z is carbon, nitrogen, phosphorus, arsenic, silicon or germanium; R', R" and R'" are independently the same or different comprising hydrogen, alkyl, haloalkyl, alkylamino, phenyl, benzyl, alkanyloyl, acetyl or benzoyl; R 1, R 3, R 4, R 6, R 7 and R 9 are the same or different, H, D, OH, halogen, nitro, CN, nitrileamido, amidosulfide, amino, aldehyde, substituted ketone, -COOH, ester, trifluoromethyl, amide, substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, arylalkyl, alkylaryl, arylsulfonyl, arylalkylenesulfonyl, alkoxy, alkylalkoxy, haloalkyl, alkylhaloalkyl, haloaryl, aryloxy, amino, monoalkylamino, dialkylamino, alkylamido, arylamino, arylamido. alkylthio, arylthio, heterocycloalkyl, alkylheterocycloalkyl, heterocycloalkylalkyl, heteroaryl, heteroarylalkyl, alkylheteroaryl; or R 3, R 4, or R 7, forms a fused cycloalkyl, heterocycloalkyl, aromatic or heteroaromatic ring with the main aromatic ring; and R 10 is nothing, H, D, OH, halogen, oxo, nitro, CN, nitrileamido, amidosulfide, amino, aldehyde, substituted ketone, -COOH, ester, trifluoromethyl, amide, substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, arylalkyl, alkylaryl, arylsulfonyl, arylalkylenesulfonyl, alkoxy, haloalkyl, haloaryl, cycloalkyl, alkylcycloalkyl, aryloxy, monoalkylamino, dialkylamino, alkylamido, arylamino, arylamido, alkylthio, arylthio, heterocycloalkyl, alkylheterocycloalkyl, heterocycloalkylalkyl, heteroaryl, heteroarylalkyl, alkylheteroaryl; or its isomer, pharmaceutically acceptable salt, pharmaceutical product, hydrate, N-oxide, crystal or any combination thereof, wherein the compound can activate or enhance telomerase expression or activity, for use in stimulating or increasing pancreatic beta-cell mass in a diabetic subject in need thereof