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We present a multiwavelength study of the cometary \hii region G12.21--0.10using the VLA and OVRO. Both radio continuum (0.3, 0.7, 2 and 3.6~cm) andspectral lines of H41$\alpha$, $^{13}$CS(2$-$1) \& (1$-$0), and NH$_{\rm3}$(2,2) \& (4,4) observations are included. We find two 3~mm continuum peakstoward G12.21--0.10, one of them is spatially coincident with the UC~H~IIregion, while the other coincides spatially with a molecular clump. We alsofind that the 0.7, 2 and 3.6~cm continuum and H41$\alpha$ line are onlydetected toward the UC~H~II region, while the $^{13}$CS, and NH$_{\rm 3}$ isspatially associated with the molecular clump. Based on the morphology, kinetictemperature ($\sim$86~K), volumetric density($\sim$1.5$\times$10$^6$~cm$^{-3}$) and linear size ($\sim$0.22~pc) of themolecular clump, we suggest this source is consistent with a hot molecularcore.

Unveiling the Hot Molecular Core in the Ultracompact \hii Region with Extended Emission G12.21--0.10