Acetic anhydride

2 alpha+2ß,17 alpha(H),21ß(H)-2-Methylhopane (ca 1:3), neat, Solvent-neat, Unit ca. 10µg , # of units-1, Cas.no. 126208-29-7/138057-81-5

1-(2,6-Dichloro-4-hydroxphenyl)-1,3-dihydroindol-2-one, 2mg

EPA Method 548.1 Internal Standard