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We report the discovery of PSJ2107-1611, a fold-configuration 4.3"-separationquadruply lensed quasar with a bright lensed arc. It was discovered using aconvolutional neural network on Pan-STARRS gri images of pre-selected quasarcandidates with multiple nearby Pan-STARRS detections. Spectroscopic follow-upwith EFOSC2 on the ESO 3.58m New Technology Telescope reveals the source to bea quasar at z = 2.673, with the blended fold image pair showing deformed broadlines relative to the other images. The flux ratios measured from optical tonear-infrared imaging in the Canada-France-Hawaii Telescope Legacy Survey,Pan-STARRS, the Legacy Surveys, and the Vista Hemisphere Survey areinconsistent with a smooth mass model as the fold pair images are about 15times too faint. Variability, time delay effects, and reddening are ruled outthrough multiple-epoch imaging and color information. The system is marginallyresolved in the radio in the Very Large Array Sky Survey S-band, where it has a10 mJy detection. The radio flux ratios are compatible with the smooth massmacromodel. This system offers a unique tool for future studies of quasarstructure with strong and microlensing. A more detailed analysis of follow-upwith JWST/MIRI, VLT/MUSE, VLT/ERIS, and data from the European Very LongBaseline Interferometer will be presented in an upcoming paper.

PSJ2107-1611: a new wide-separation, quadruply imaged lensed quasar with flux ratio anomalies