10-HydroxyCamptothecin 19685-09-7 C20H16N2O5 light yellow crystalline; 99.5% PHC gastric cancer; Bladder cancer; rectal cancer; NSCLC; Squamous cell carcinoma leukemia OTHERS: Capecitabine  154361-50-9 C15H22FN3O6 loss on drying