I admit I don't know chemistry (the science, not the code). So I can't determine what would be the best way to present this. I'm not sure that the tiny 2 above the 6 in the second equation is actually a replacement. The 6 is cancelled in 2 places which then wouldn't require a replacement. Also, the symbol before the H is a Greek cap delta. I will see if I can find someone to make sense of this.