(Proposal ID) S14A-168 (PI) An, Deokkeun (Proposal Title) Characterization of Methanol Ice around Massive YSOs in the Galactic Center (Abstract) We propose to obtain moderate-resolution L-band spectra of one of the newly discovered massive young stellar objects (YSOs) in the Galactic center (GC). These YSOs exhibit a characteristic shape of CO_2 ice absorption band at 15 mum - 15.6 mum in our Spitzer/IRS, where the "shoulder" CO_2 ice component centered at 15.4 mum makes the band particularly broad. The shoulder ice absorption is ascribed to CO_2 ice grains mixed with a large amount of CH_3OH, and has only been found in previously known massive YSOs in the Galactic disk. However, it is not known well how star formation proceeds in the hostile GC molecular clouds, and whether the same chemical networks are in operation as in the normal star-forming regions in the disk to produce the observed shape of the 15 mu m CO_2 absorption. To confirm this hypothesis, we will use the Subaru/IRCS to obtain high signal-to-noise L-band spectra, aiming to detect 3.535 mu m ice band, which is solely produced by CH_3OH ice grains, and will measure the CH_3OH ice column density in the GC. If confirmed, this would not only be the first detection of the solid CH_3OH of GC YSOs, which is the basis of forming more complex molecules, but also provide an important clue on the astrochemical process in the nuclear star-forming regions.