Kumari, G. N. Krishna published the artcileCarbon-13 NMR data of flavonol methyl ethers of Solanum pubescens, HPLC of Formula: 69097-99-0, the publication is Proceedings – Indian Academy of Sciences, Chemical Sciences (1986), 97(2), 171-6, database is CAplus.
The 13C NMR data of flavonol 3-Me ethers indicated that the methylation of one of the OH groups in the o-dihydroxy system causes an upfield shift in the unsubstituted o-carbon as usual, but with the other hydroxylated o-carbon the shift is always downfield. The spectra of the acetates indicated that 5-acetoxy resonated downfield compared to that of other acetoxy groups. The 13C NMR data of these compounds is reported for the 1st time.
Proceedings – Indian Academy of Sciences, Chemical Sciences published new progress about 69097-99-0. 69097-99-0 belongs to tetrahydropyran, auxiliary class Other Aliphatic Heterocyclic,Benzene,Phenol,Ether,Inhibitor, name is 5,7-Dihydroxy-2-(3-hydroxy-4-methoxyphenyl)chroman-4-one, and the molecular formula is C16H14O6, HPLC of Formula: 69097-99-0.
Referemce:
https://en.wikipedia.org/wiki/Tetrahydropyran,
Tetrahydropyran – an overview | ScienceDirect Topics