At the MP4(SDTQ)/6-311G ★★//MP2/6-31G ★★+ ZPE level of theory, HeBCH is predicted to be unstable towards helium dissociation by −6.0 kcal mol , but HeBeO is calculated to be a stable molecule by + 3.2 kcal mol . Convened to the reaction enthalpy, the latter value increases to + 3.9 kcal mol .