SLC2A1 and cancer: Both 1 and 2 showedhigher singlet oxygen quantum yields than 3 and 4, due to the enhanced singlet-to-triplet intersystem crossing.To evaluate the targeting effect of the glycosylated derivative, invitro experiments were performed using glucose transporter 1 (GLUT1)-positiveHT29 and A549 cancer cells, and noncancerous HEK293 cells as control.Both 1 and 2 showed higher cellular uptakethan 3 and 4.