abstract
active substance
black
blackboard
chalk
chalkboard
chemical
chemical formula
chemical structure
chemistry
codeine
cough suppressant
dark background
drawing
drug
formula
graphic
handwriting
hydrocodone
illustration
lettering
letters
medical
medicine
molecular
molecule
morphine
opioid
painkiller
pattern
pharmaceutical
pharmacy
remedy
research
science
scientific
scripture
sign
structural
structure
substance
symbol
technology
text
write
writing
written
定額
Blackboard with the chemical formula of Hydrocodoneの素材 [FY31039386676]
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