Main Reaction: CO2 +2 NADH2 +2 ADP + phosphoenolpyruvate >> succinic acid + ATP +2 NAD+

Reference: PubMed ID: 22653682
Authors: Rivaldi JD, Sarrouh BF, Branco Rde F, de Mancilha IM, da Silva SS
Title: Biotechnological utilization of biodiesel-derived glycerol for the production of ribonucleotides and microbial biomass.
Published: 2012 Aug

CO2 + 2 NADH2 + 2 ADP + phosphoenolpyruvate --> succinic acid + ATP + 2 NAD