We present Atacama Large Millimeter/submillimeter Array observations of CO lines and dust continuum emission on the source RCSGA 032727-132609, a young z=1.7 low-metallicity starburst galaxy. The CO(3-2), CO(6-5) lines and continuum at rest-frame 450 m are detected with high significance and show a resolved structure in the image plane. We used the corresponding lensing model to obtain a source plane reconstruction of the detected emission. The intrinsic properties of RCSGA 032727-132609 show an enhanced star-formation activity compared to local spiral galaxies with similar molecular gas densities, supporting the starburst phase scenario
