It isn’t aspertame as that’s been heavily used in all sorts of sugar free things for decades. However, it’s heat sensitive and might also be as acid sensitive,

It isn’t aspertame as that’s been heavily used in all sorts of sugar free things for decades. However, it’s heat sensitive and might also be as acid sensitive, going skunky tasting over time. Asulfame-k (sp) has replaced it a while back. Can’t abide splenda and it helped me break a diet Pepsi habit from really ancient times. Canad allows cyclamate which is reasonable tasting, and I’m one of those who find stevia bitter rather than sweet. Who knows what’s in cokes secret ingredients and whether the water used to make the canned product was tainted. Take one from the pack to have it analyzed if you get sick. Could somebody post the artificial sweeteners used? I thought it was intended to compete with Pepsi Max which has a thicker taste than diet pepsi.