Nicotineamide-adenine dinucleotide phosphate

In photosynthesis, light energy is trapped and converted to chemical energy as reduced coenzymes (e.g., nicotineamide-adenine dinucleotide phosphate [NADPH]), triphosphates (e.g., ATP), and 02. Oxygen is a poisonous waste product in plants, although they also need some oxygen in mitochondrial respiration. 

The left half-cell is the one supplying electrons to the process NADPH. Yes, the reduced form of nicotineamide adenine dinucleotide phosphate is the zinc electrode in the Daniell cell, and we re-write its reductive half-reaction ... 

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