Valoneic acid dilactone

Names
Preferred IUPAC name 3,4,5-Trihydroxy-2-[(3,7,8-trihydroxy-5,10-dioxo-5,10-dihydro[1]benzopyrano[5,4,3-cde][1]benzopyran-2-yl)oxy]benzoate
Other names Valoneic acid bislactone Valoneic acid bilactone
Identifiers
CAS Number	60202-70-2 Y
3D model (JSmol)	Interactive image
ChemSpider	8327382 N
PubChem CID	10151874
UNII	UH5C3DT5LR Y
CompTox Dashboard (EPA)	DTXSID60436184
InChI InChI=1S/C21H10O13/c22-7-2-6(19(28)29)16(15(27)12(7)24)32-9-3-5-11-10-4(20(30)34-18(11)14(9)26)1-8(23)13(25)17(10)33-21(5)31/h1-3,22-27H,(H,28,29) N Key: BPAOAXAAABIQKR-UHFFFAOYSA-N N InChI=1/C21H10O13/c22-7-2-6(19(28)29)16(15(27)12(7)24)32-9-3-5-11-10-4(20(30)34-18(11)14(9)26)1-8(23)13(25)17(10)33-21(5)31/h1-3,22-27H,(H,28,29) Key: BPAOAXAAABIQKR-UHFFFAOYAM
SMILES Oc1cc5c(=O)oc3c(O)c(Oc4c(C(=O)O)cc(O)c(O)c4O)cc2c3c5c(c1O)oc2=O
Properties
Chemical formula	C21H10O13
Molar mass	470.28 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Valoneic acid dilactone is a hydrolysable tannin that can be isolated from the heartwood of Shorea laevifolia^[1] and in oaks species like the North American white oak (Quercus alba) and European red oak (Quercus robur).^[2]

It shows an inhibitory effect on 5α-reductase,^[1] an enzyme involved in steroids metabolism and prostate cancer.