When Barry discovers the sedative being used in Blood's mirakuru formula is ketamine, his computer screen is shown with a diagram of the substance's molecular structure. What is shown here is very close to what medical grade ketamine's chemical formula looks like, but what is shown is the precursor to ketamine. Medical grade ketamine is actually racemic ketamine, the chemical formula shown on the screen is for racemic ketamine's enantiomer, known as (S) ketamine. A substance that is racemic has the same chemical makeup and structure as the original substance, but its structure is the mirror opposite, so in other words it looks like an upside down version of the original chemical diagram.
When Felicity and Flash get a plate match on car used for stealing the Centrifuge, the message on screen says "3000 cc blood stolen". Felicity reads to others "30,000 cc blood stolen".