The four main flavanolignans of silymarin (the active constituents of milk thistle extract) are: silybinin, isosilybinin, silydianin, and silychristin. Silybinin (or just silybin) is the most plentiful (about 60% of silymarin) and is also considered the most active. Silymarin is derived from the seeds of silybum marianum plant; it has shown in many in vivo and in vitro studies to have hepatoprotective, antioxidant, anti-inflammatory, and anti-carcinogenic properties.

CAS NO:22888-70-6;65666-07-1

EC NO:245-302-5

Molecular Formula:C₂₅H₂₂O₁₀

Molecular Weight:482.4362

Synonyms:;Silibinin;Silybin;silymarin group;2,3-Dihydro-3-(4-hydroxy-3-methoxyphenyl)-2-(hydroxymethyl)-6-(3,5,7-trihydroxy-4-oxobenzopyran-2-yl)benzodioxin;Silybum marianum;Silybum Extract;(2R,3R)-3,5,7-trihydroxy-2-[(2R,3R)-3-(4-hydroxy-3-methoxyphenyl)-2-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl]-2,3-dihydro-4H-chromen-4-one;(2R,3R)-3,5,7-trihydroxy-2-[(2S,3S)-3-(4-hydroxy-3-methoxyphenyl)-2-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl]-2,3-dihydro-4H-chromen-4-one;Milk Thistle Extract;Milk Thistel P.E.;

Molecular Structure: