"the penicillin that constitutes the principal component of many commercial antibiotics"@en-us . . . . . "103910723"^^ . . . . "03910723-n"^^ . "penicillin G"^^ . "benzylpenicillin"@en-us . . . "penicillin G"@en-us . . "0"^^ . "103763105"@en-us . . "0"^^ .