Related Clues:

• ____ acid
• Building block, informally
• Kind of group, in chemistry
• Acid intro
• Protein-building acid
• Athletic shoe brand
• Essential -- acids
• -- acids
• Kind of resin
• Of element #5
• See 36 Across
• __ acid (protein component)
• Kind of protein-building acid
• Antiseptic acid
• Strong acid