A Clinical Trial of CoFactor Formulations and Leucovorin Administered Intravenously in Healthy, Adult Subjects.

Inclusion Criteria:

• Males and Females age 18-65 inclusive at screening.
• Subject has to agree to practice abstinence or medically accepted contraception and not to participate in sperm donation or in vitro fertilization.
• Body Mass Index in the range of 18 to 30 kg/m2 and body weight of 45 to 95 kg.
• Subject must be healthy as determined by the investigator on the basis of screening evaluations.
• Subject must be nonsmoker or smoker of fewer than 10 cigarettes per day as determined by history. Must be able to abstain from smoking during the in-clinic stay.

Exclusion Criteria:

• Presence of clinically significant illness within 21 days prior to dosing, viral or bacterial infection, or documented drug allergies that may affect subject's safety during the study.
• Laboratory or clinical evidence suggestive of disease.
• Clinically significant or predisposing disorder that may interfere with the absorption, distribution, metabolism and/or excretion of drugs.
• History of drug abuse within 1 year of dosing and/or admitted alcohol abuse or history of alcohol use that may interfere with the ability to comply.
• Pregnant, lactating, or positive pregnancy test.
• Clinically significant electrocardiogram abnormalities.
• History of positive test for hepatitis B or C, or HIV.
• Positive findings of urine narcotic screen.
• History of drug allergy.