Levonorgestrel CAS NO.: 797-63-7 Assay: 99% Formulae hypotheticae: C21H28O2 pondus hypotheticum: 312.45 Quality Standard: USP Aspectus: Album vel fere album crystallinum pulveris Ritus: Progesterone medicamento, propter irregulares menstruis, eget uteri, endometriosis, etc