Koike, Takeshi published the artcileTotal synthesis of racemic ligularone and isoligularone, Computed Properties of 31253-08-4, the publication is Chemical & Pharmaceutical Bulletin (1999), 47(6), 897-899, database is CAplus.
Racemic ligularone (I) and isoligularone (II) were synthesized from the cis-4aβ,5,6,7,8,8a-hexahydro-8β,8aβ-dimethylnaphthalene-1,3(2H,4H)-dione (III) by furannulation reaction with diethyl(prop-2-ynyl)sulfonium bromide, prepared from di-Et sulfide and propargyl bromide.
Chemical & Pharmaceutical Bulletin published new progress about 31253-08-4. 31253-08-4 belongs to iodides-buliding-blocks, auxiliary class Iodide,Ester, name is Ethyl 2-Iodopropionate, and the molecular formula is C5H9IO2, Computed Properties of 31253-08-4.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com