I could not access the paywalled paper. Gratefully fanzhang answered my question below:
fanzhang:>The paper says: Metformin, Psora-4, Rapamycin, Rifampicin, and Allantoin.
Here's a 2017 article w/o paywall which identified the five drugs above and also the best combinations (for worms) at that time:
"Rapamycin,rifampicin, Psora-4 cocktail doubles lifespan":
https://alivebynature.com/rapamycinrifampicin-psora-4-cockta...
The article states that the most successful one(at that time) was rapamycin + rifampicin + allantoin, resulting in a doubling of mean lifespan.