The nearest found maser object is G0.6738-0.0189 (offset by   0.7" from input coordinates) 
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display_aladin("266.8225000","-28.3703560","G0.6738-0.0189","G0.6738-0.0189","Sgr B2 (-45 52), Sgr B2 (-45 55), Sgr B2 (-46 52)","0")