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   61117
   PKS1830-211 is a gravitationally lensing system which emits gamma-rays
   (> 100 MeV) and radio waves. We detected molecular lines (HCN, H2CO,
   CS) from this lensing object with the Nobeyama 45m telescope. To derive
   molecular abundances in the lensing object at z=0.89, we propose ASCA
   observation of PKS1830-211. Since X-ray emission from the lensed EGRET
   blazer is expected well above ASCA sensitivity, X-ray absorption in low
   energy bands gives us a total column density of the lensing object. We
   can also study multi-wavelength spectrum of the lensed blazer and a
   gravitationally lensing system.
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