Ethanol standard in water,1.5g/L,water, 1.5mL

Sildenafil-d3 (N-methyl-d3-piperazine), 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 1126745-90-1

EPA Method 502.2 Internal Standard

EPA Method 551 “Mix B”