We are likely a few hundred years away from actually synthesizing a close equivalent and if we do, this one most likely is THE molecule for planet Earth. Other molecules may be suited for other stars and other atmospheres, but clearly chlorophyll won the race of the most efficient simplest molecule to best utilize the resources of our planet.

I'd think we could probably engineer similarly insanely capable biotech if we were completely reckless, committed a serious fraction of our resources and people, and had infinite Earths to ruin in the process.

I'm not sure how GMO's are handled, but I'm guessing it's a quite restrictive on the engineering side and somewhat cautious in implementation.

actually we have solar panels and electrolysis of water, which produces hydrogen, which you can perceive to be H2, which is H-(CH2)0-H, so it's the simplest (zeroth) hydrocarbon if you will. Not quite glucose, but it's something.

btw i give H2 the name zen-ane (where zen means zero and -ane means it's an alcane).