  We present the results of a molecular survey of comet 46P/Wirtanen undertaken
with the IRAM 30-m and NOEMA radio telescopes in December 2018. Observations at
IRAM 30-m during the 12-18 Dec. period comprise a 2 mm spectral survey covering
25 GHz and a 1 mm survey covering 62 GHz. The gas outflow velocity and kinetic
temperature have been accurately constrained by the observations. We derive
abundances of 11 molecules, some being identified remotely for the first time
in a Jupiter-family comet, including complex organic molecules such as
formamide, ethylene glycol, acetaldehyde, or ethanol. Sensitive upper limits on
the abundances of 24 other molecules are obtained. The comet is found to be
relatively rich in methanol (3.4 percent relative to water), but relatively
depleted in CO, CS, HNC, HNCO, and HCOOH.
