Urea (13C) Product Catalog # Size Price (USD) Quantity Urea (13C)291805-1G1 gPlease InquirePlease InquireUrea (13C)291805-5G5 gPlease InquirePlease InquireUrea (13C)291805-25G25 gPlease InquirePlease Inquire Description Labeled CAS #: 58069-82-2 Unlabeled CAS #: 57-13-6 Molecular Formula: (13C)H4N2O Molecular Weight: 61.0