  Aims: We study the molecular environment of the luminous blue variable star
G24.73+0.69 to investigate the origin of the two infrared shells around this
massive star and to determine its effects on the surrounding interstellar
medium. Methods: We analyze the distribution of the molecular gas using the
13CO J=1-0 emission extracted from the Galactic Ring Survey. We use near- and
mid-infrared data from 2MASS and GLIMPSE to identify the young stellar objects
in the field. Results: We discover the molecular counterpart of the outer
infrared shell around G24.73+0.69. The CO shell was probably blown by the
stellar wind of the star mainly during its main sequence phase. We also find
molecular gas that corresponds to the inner infrared shell, although its origin
remains uncertain. We find seven young stellar objects upon the molecular
material, whose birth might have been triggered by the stellar wind of the
luminous blue variable star. We suggest that both G24.73+0.69 and the
progenitor of the nearby supernova remnant G24.7+0.6 were formed from the same
natal cloud and represent the most evolved members of a so far undetected
cluster of other massive stars.
