GDP-alpha-D-mannose = GDP-4-dehydro-alpha-D-rhamnose + H2O
gdp-alpha-d-mannose = gdp-4-dehydro-alpha-d-rhamnose + h2o
GDP-alpha-D-mannose = GDP-4-dehydro-alpha-D-rhamnose + H2O
gdp-alpha-d-mannose = gdp-4-dehydro-alpha-d-rhamnose + h2o