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Chemistry and biological activities of caffeic acid derivatives from Salvia miltiorrhiza.
- R. Jiang, K. Lau, Po-Ming Hon, T. C. W. Mak, Kamsang Woo, K. Fung
- Chemistry, Medicine
- Current medicinal chemistry
Caffeic acid (3,4-dihydroxycinnamic acid), one of the most common phenolic acids, frequently occurs in fruits, grains and dietary supplements for human consumption as simple esters with quinic acid… Expand
New antiviral cassane furanoditerpenes from Caesalpinia minax.
A bioassay-guided study led to the isolation of five new cassane furanoditerpenes, designated as caesalmin C (1), D (2), E (3), F (4), and G (5), along with stigmasterol (6) from the seeds of… Expand
A comparative study on aqueous root extracts of Pueraria thomsonii and Pueraria lobata by antioxidant assay and HPLC fingerprint analysis.
The roots of Pueraria thomsonii and Pueraria lobata are officially recorded in Chinese Pharmacopoeia under the same name Radix Puerariae. However, the aqueous root extract of Pueraria lobata showed… Expand
On the Absolute Structure of Optically Active Neolignans Containing a Dihydrobenzo[b]furan Skeleton.
Five new Ocotillone-type saponins from Gynostemma pentaphyllum.
Five new ocotillone-type saponins, gynosides A-E (1-5), along with 10 known dammarane-type saponins, were isolated from the aerial parts of Gynostemma pentaphyllum. The structures of these new… Expand
Crystal structure of betaine monohydrate, (CH3)3NCH2COO·H2O
- T. C. W. Mak
- 2 April 1990
Abstract Betaine monohydrate, (CH 3 ) 3 NCH 2 COO·H 2 O, crystallizes in the space group Pbca with a = 9.475(1), b = 11.512(2), c = 13.095A and Z = 8. The crystal structure ( R F = 0.059 for 1056… Expand
Molecular structures of two bicyclo-(3.2.1)-octanoid neolignans from Piper kadsura
Abstract The molecular structures of two bicyclo-(3.2.1)-octanoid neolignans, kadsurenin C (1) and kadsurenin H (2), have been determined by single-crystal X-ray analysis. Compound 1 represents a… Expand
Sesquiterpene lactones from Elephantopus scaber
Abstract The whole plant of Elephantopus scaber afforded the known deoxyelephantopin and isodeoxy-elephantopin, and a new germacranolide sesquiterpene lactone named scabertopin, whose structure and… Expand
Refinement of the crystal structure of zirconyl chloride octahydrate
- T. C. W. Mak
- 15 November 1968
The crystal structure of zirconyl chloride octahydrate, ZrOCl2•8H2O, has been refined by the least-squares method with new three-dimensional data. Existence of the [Zr4(OH)8(H2O)16]8+ tetranuclear… Expand
Synthesis and structural characterization of the new quadridentate N3S-compound di-2-pyridyl ketone thiosemicarbazone and its binuclear copper(II) complexes
The new quadridentate, N3S-compound di-2-pyridyl ketone thiosemicarbazone (HL) has been characterized by spectroscopic techniques and single-crystal X-ray analysis. The thiosemicarbazone moiety… Expand