  We report the results of radio interferometric observations of the 21-micron
source IRAS 22272+5435 in the CO J=2-1 line. 21-micron sources are carbon-rich
objects in the post-AGB phase of evolution which show an unidentified emission
feature at 21 micron. Since 21-micron sources usually also have circumstellar
molecular envelopes, the mapping of CO emission from the envelope will be
useful in tracing the nebular structure. From observations made with the
Combined Array for Research in Millimeter-wave Astronomy (CARMA), we find that
a torus and spherical wind model can explain only part of the CO structure. An
additional axisymmetric region created by the interaction between an invisible
jet and ambient material is suggested.
