Producers of metals and other raw materials ticked down amid worries about the timing of vaccine distribution.
Some dollar-denominated commodities gained in value, however, as the greenback continued a losing streak against other major currencies.
The materials sector has been among the major beneficiaries of dollar weakness and a rotation into "value" sectors.
Gold futures rose for a third straight session, closing at a roughly two-week high of $1836 an ounce.
Copper futures ticked up to a new seven-year high after strong Chinese services-sector data.
Wheat futures fell as signs of ample supply overwhelmed hopes of increased Chinese imports.
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(END) Dow Jones Newswires