A benzooxyquinazoline alkaloid, samoquasine A (1), has been isolated from the seeds of Annona squamosa, and its structure was elucidated by spectroscopic and chemical methods.

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We report strong electron-electron interactions in quantum wires etched from an InAs quantum well, a material known to have strong spin-orbit interactions. We find that the current through the wires as a function of the bias voltage and temperature follows the universal scaling behavior of a Tomonaga-Luttinger liquid. Using a universal scaling formula, we extract the interaction parameter and find strong electron-electron interactions, increasing as the wires become more depleted. We establish theoretically that spin-orbit interactions cause only minor modifications of the interaction parameter in this regime, indicating that genuinely strong electron-electron interactions are indeed achieved in the device. Our results suggest that etched InAs wires provide a platform with both strong electron-electron and strong spin-orbit interactions. * sato@meso.t.u-tokyo.ac.jp; Contributed equally to this work † matsuo@ap.t.u-tokyo.ac.jp; Contributed equally to this work