GDP-4-dehydro-alpha-D-rhamnose + NADPH + H(+) => GDP-beta-L-fucose + NADP(+)
gdp-4-dehydro-alpha-d-rhamnose + nadph + h(+) => gdp-beta-l-fucose + nadp(+)
GDP-4-dehydro-alpha-D-rhamnose + NADPH + H(+) => GDP-beta-L-fucose + NADP(+)
gdp-4-dehydro-alpha-d-rhamnose + nadph + h(+) => gdp-beta-l-fucose + nadp(+)