= Resveratrol
\b[Resveratrol] is a hydroxylated <stilbene> with <hydroxy groups> at positions 3, 5 and $4'$. Its neutral <molecular formula> is $\mathrm{C_{14}H_{12}O_3}$. The ChEBI parent record specifies this connectivity while leaving the central <double bond>'s geometry unspecified, and distinguishes <cis-Resveratrol> and <trans-Resveratrol> as separate members.<Resveratrol in ChEBI>[CHEBI:27881, definition, structure, formula and incoming cis/trans relations]{ref}
The <stilbene> backbone has two <phenyl groups> connected through $\mathrm{CH{=}CH}$. Replacing three ring hydrogen atoms with <hydroxy groups> adds three oxygen atoms without changing the total hydrogen count relative to $\mathrm{C_{14}H_{12}}$. The labels 3 and 5 refer to one aromatic ring, whereas the prime in $4'$ distinguishes a position on the other ring.
<Cis-trans isomerism> concerns arrangement around the central <double bond>, not the number of oxygen atoms. Like <cis-Stilbene> and <trans-Stilbene>, the two resveratrol geometries share a <molecular formula>. A formula measurement alone cannot distinguish them.
For an original amount calculation, using rounded <molar mass> $M=228.25\,\mathrm{g\,mol^{-1}}$ gives
$$
m=nM=(50.0\times10^{-6}\,\mathrm{mol})(228.25\,\mathrm{g\,mol^{-1}})
\simeq11.41\,\mathrm{mg}.
$$
Both geometries give the same formula-based mass calculation. It establishes an amount-to-mass conversion for the specified neutral compound, not its isomeric purity or solution concentration after losses.
Resveratrol is also an instructive assay-interference example. Primary experiments observed cell-free <MTT> reduction in its presence.<Interference of plant extracts, phytoestrogens and antioxidants with the MTT tetrazolium assay by Regina Bruggisser and others>[Abstract, resveratrol in the cell-free system]{ref} Formation of colored <formazan> can therefore reflect direct chemical reduction without any cells being present. A <cell-free tetrazolium interaction contrast> helps separate a reagent-dependent contribution from compound-only optical background; a separate validated observation is needed to infer <cell viability>.
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