26. Sexually active men or women of childbearing potential who are unwilling to practice adequate contraception during the study (adequate contraceptive measures are defined as the use of two highly effective forms of birth control, include stable use of oral contraceptives or other prescription pharmaceutical contraceptives; intrauterine device; bilateral tubal ligation; vasectomy; condom plus contraceptive sponge, foam, or jelly, or diaphragm plus contraceptive sponge, foam, or jelly)