Answer: Phospho glyceric acid
Notes: The first product of photosynthesis is a three-carbon compound called phosphoglyceric acid and phosphoglyceraldehyde. Almost immediately, two of these join to form a glucose molecule. Certain herbaceous plants such as sugarcane, corn, and sorghum, form as the first products of photosynthesis not three-carbon but four-carbon compounds— oxalacetic, malic, and aspartic acids.
