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A nicotinamide dinucleotide that is NADPH in which the anomeric centre of the ribosyldihydronicotinamide moiety has alpha- rather than beta-configuration." []

NADPH is the reduced form of NADP+, and NADP+ is the oxidized form of NADPH. Nicotinamide adenine dinucleotide phosphate (NADP) is a coenzyme composed of ribosylnicotinamide 5'-phosphate (NMN) coupled with a pyrophosphate linkage to 5'-phosphate adenosine 2',5'-bisphosphate. NADP serves as an electron carrier in a number of reactions, being alternately oxidized (NADP+) and reduced (NADPH). NADP is formed through the addition of a phosphate group to the 2' position of the adenosyl nucleotide through an ester linkage (Dorland, 27th ed). This extra phosphate is added by the enzyme NAD+ kinase and removed via NADP+ phosphatase. NADP is also known as TPN (triphosphopyridine nucleotide) and it is an important cofactor used in anabolic reactions in all forms of cellular life. Examples include the Calvin cycle, cholesterol synthesis, fatty acid elongation, and nucleic acid synthesis (Wikipedia).

An NADP obtained by formal reduction of the 1,2-position in the pyridine ring of beta-NADP." []

An NADP obtained by formal reduction of the 1,6-position in the pyridine ring of beta-NADP." []

A nicotinamide dinucleotide that is NADPH in which the anomeric centre of the ribosyldihydronicotinamide moiety has alpha- rather than beta-configuration." []