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