Isotopes Bonds Isotope type Reduced mass [mAmB/(mA+mB)]
12C-12C Lighter 6.00
13C-12C Heavier 6.26
1H-12C Lighter 0.923
1H-13C Heavier 0.929
2H-12C Heavier 1.71
1H-18O Heavier 0.94
2H-16O Heavier 1.77
18O-12C Heavier 7.20
16O-13C Heavier 7.17
Table 3: Possible isotopic bonds in butylatedhydroxytoluene and 4-methoxyphenol. mA: Mass of an atom A; mB: Mass of an atom B; A may be C or H and so on.