Patent ID: 7754930

Claim:
Benzene comprising deuterium and 13 C in amounts in amounts such that δ(deuterium) for the benzene is less than −250 and δ( 13 C) for the benzene is greater than −36, wherein δ(deuterium) and δ( 13 C) are as defined as follows: δ(deuterium)=(R′ sample /R′ standard −1)×1000 where R′ sample is the ratio of deuterium to hydrogen in the benzene; and R′ standard is the ratio of the natural abundance of deuterium to the natural abundance of hydrogen; and δ( 13 C)=(R″ sample /R″ standard −1)×1000 where R″ sample is the ratio of 13 C to 12 C in the benzene; and R″ standard is the ratio of the natural abundance of 13 C to the natural abundance of 12 C.