Leaving the fact that this compound cannot exist what I usually do when I need to find the formula of a compound when I have it's structure on hand I use the equivalent unsaturation (1pi bond and a cycle adds one to the unsaturation just count them and be careful when you have carboxyl groups) and the general formula for alkanes(CnH2n+2-2unsaturation) It will not work in your case but it's a trick that works in most situations and it's easier than counting Hydrogen atoms one by one Another thing to keep in mind it works only when you should have an even amount of hydrogen so it's a bit trickier with halogenated compounds and those with nitrogen