naphtholsulfonic acid

noun
naph·thol·sul·fon·ic acid
variants: or chiefly British naphtholsulphonic acid \-ˌsəl-ˌfän-ik-, -ˌfōn- \

Medical Definition of naphtholsulfonic acid 

: any of several sulfonic acids derived from the naphthols and used as dye intermediates

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