Structure of “sugar T”

Astrophysics in 1997

“…To probe still more distant and long-ago structure, we turn to quasars and the absorption lines in their spectra. No candidate for "most distant structure" will receive a prize here, but Lya absorption clouds at show clumping, pairing, and clus-z ϭ 3-4 tering at scales from 100 km s Ϫ1 (Lu et al 1996;Khare et al 1997) to 1000-1500 km s Ϫ1 (Christiani et al 1997;Lespine & Petitjean 1997). These assorted structures are apparently more or less continuous in properties with those to be found in the clouds of higher column density that produce absorption lines of heavy elements.…”

Triterpenoid saponins and C21 steroidal glycosides from Gymnema tingens and their glucose uptake activities

“…29 Previous phytochemical studies on Gymnema tingens have led to the isolation and identification of triterpenoids, steroids, phenolic glycosides, and several other components. 30–32 However, few studies have been reported on its bioactive components with respect to possible antidiabetic activity. In our previous investigation, we found that the EtOAc fraction of G. tingens showed a good activity on glucose uptake.…”

Two New C21 Steroids from Gymnema tingens

“…It is a folklore medicine in China used for the treatment of rheumatism and polio [1] . Till now, some studies have been reported on the chemical compositions of Gymnema tingens , [17–20] among which the main chemical constituents included 3,4‐anhydro‐2,6‐dideoxy‐ β ‐D‐ribo‐hexopyranosyl 6‐deoxy‐3‐ O ‐methyl‐ β ‐D‐allopyranoside, gymnetinosides A−F, and gymnefuranols A−B.…”

“…It is a folklore medicine in China used for the treatment of rheumatism and polio. [1] Till now, some studies have been reported on the chemical compositions of Gymnema tingens, [17][18][19][20] [21] The further HMBC correlations from δ H 5.19 (H-12) to δ C 171.9(C-1''), δ H 2.16 (H-2'') to δ C 171.9 (C-1''), δ 2) between H-9 (δ H 2.51) and H-12 (δ H 5.19), indicated the α-orientation of H-9. [22] In addition, in 20-hydroxy-C/D-cis-pregnane-type steroids, steric hindrance between methyl groups CH 3 -18 and CH 3 -21, methylene group CH 2 -16, and the substituent at C-20 led to the deduction of the 20S configuration.…”