I think is not an acid at all, it´s a flavonoid, a family of plant chemical compounds (plant pigments).

Flavanone it´s a derivative of flavone.

References:

pascalMono/corpus/doc : Biotransformation of flavone and flavanone ...
Les OGM. Biotransformation of flavone and flavanone by Streptomyces lividans cells carrying shuffled biphenyl dioxygenase genes. Sommaire. ...
dilib.inist.fr/.../dps/public/dps/Veille/ Manifestations/IExpo/OGM/Index/Server/FR.corpus.ETI.wsh+000054

Cancer Spectrum: CANCERLIT® Citation
... Abstract: The inducing effects of some flavonoids (flavone, flavanone, tangeretin and quercetin) and model substances have been studied in rats, and the ...
jncicancerspectrum.oupjournals.org/ cgi/cancerlit/8931757

PDF] PII: S0031-9422(01)00191-1
Formato de archivo: PDF/Adobe Acrobat
... Conversion of flavanone to flavone, dihydroflavonol and flavonol with an enzyme system from cell cultures of parsley. Zeitschrift ...
www.natural-flavonoids.de/.../Martens et al. %20Phytochem.%202001%20Cloning%20flavone%20synthase%20I.pdf

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Note added at 30 mins (2004-07-03 09:36:05 GMT)
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Italian references:

CHIMICA ORGANICA II
... Sintesi di Robinson del Flavilio, Flavanone, Flavone. SISTEMI 1,3 DIPOLARI
Nitrilossidi, Nitrilimmine, Diazoalcani. Metodi di preparazione. ...
www.dipchi.unict.it/05Didattica/ programmi_chim/organica2.htm

capitolo 4 paragrafo3
... Ho effettuato vari studi in Germania ma sono poi ritornata a Berna, dove ho sintetizzato
il flavanone ed il flavone nel laboratorio di Von Konstanecki. ...
www.ips.it/scuola/concorso_99/profumo/c4par3.htm

PDF] Sostanze fenoliche
... STIRILPIRONI Biosintesi: Yangonina Kawaina Es.: FLAVONOIDI Biosintesi: malonil Co
A Naringenina (Flavanone) Apigenina (Flavone) Genisteina (Isoflavone) 2R, 3R ...
www.natural1.it/chimica/chimica06_02.pdf