The condensation of 4-amino-9-methoxy psoralene (4-aminoxanthotoxin) with some aromatic aldehydes led to the formation of 4-arylimine xanthotoxin derivatives 2a–h, which were cyclized with mercaptoacetic acid to afford the thiazolidinone derivatives 3a–h. On the other hand, the reaction of aminoxanthotoxin 1 with some anhydrides afforded 4-imidione derivatives 3a–d. When 1 reacted with some isothiocyanates, the thiourea derivatives 5a– ...