= Flavone in the NIST Chemistry WebBook
https://webbook.nist.gov/cgi/cbook.cgi?ID=C525826&Mask=224&Units=SI
NIST Chemistry WebBook SRD69, flavone CAS525-82-6: formula C15H10O2, standard InChI and structure, with linked electron-ionization mass spectrum and UV/visible spectrum. Main identity section reports molecular weight 222.2387 under its atomic-weight convention; this small difference from the ChEBI average mass is not evidence of a different compound. No uninspected spectral peak assignment asserted.
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