PGA is the first stable product of The Calvin Cycle of photosynthesis.
RuBP
RuBP, ribulose bisphosphate.But, you may be looking for glyceraldehyde-3-phosphate as the answer as it is a product of the Calvin cycle.
Calvin Coolidge
RuBP
RuBP
RuBP
RuBP
RuBP
RuBP
RuBP
RuBP