Thiamine is Vitamin B1.
Addition of a pyrophosphate to thiamine (from ATP) converts
it to thiamine pyrophosphate, a molecule that is the coenzyme
for all decarboxylations of 
-keto acids.
Thiamine is Vitamin B1.
Addition of a pyrophosphate to thiamine (from ATP) converts
it to thiamine pyrophosphate, a molecule that is the coenzyme
for all decarboxylations of -keto acids.