obsolete negative regulation of hydroxymethylglutaryl-CoA reductase (NADPH) activity (obsolete GO:2001216)
OBSOLETE. Any process that stops, prevents or reduces the frequency, rate or extent of hydroxymethylglutaryl-CoA reductase (NADPH) activity.
negative regulation of 3-hydroxy-3-methylglutaryl-coenzyme A reductase activity
related
negative regulation of HMG-CoA reductase activity
related