Following the previous post on the IRAM 30m. Summerschool on Millimeter Astronomy, Dr. Javier R. Goicoechea will be one of the nine invited lecturers at the School. Our outstanding researcher will give a lecture on the Chemistry of the Interstellar Medium with a special enphasis on the prototypical regions: SgrB2 and Orion KL. These objects are the brightest Far-Infrared regions in the sky. SgrB2 is one of the most massive star-forming regions in the Galaxy and it is associated to a giant and dense molecular cloud in the Galaxy nucleus. Orion KL is the closest most active star-forming region in the galactic disc and it is also associated to a dense giant molecular cloud.