Product Name: Tadalafil/ Cialis CAS: 171596-29-5 Molecular formula: C22H19N3O4 Molecular weight: 389.4 Assay: 99.5%min Appearance: off-white crystalline powder Usage: an oral drug that is used for treating impotence (the inability to attain or maintain a penile erection) and benign prostatic hyperplasia (BPH)