00519nam a2200217Ia 4500008004100000041001200041082001400053082001100067100001600078100001800094100001100112245004000123260001300163260001300176260000900189300001500198365002500213650001800238650002600256650001900282150909s9999    xx            000 0 und d  aEnglish  a 574 .192  bKIS/CH  aBrown G M    aKisliuk R L    eEditor  aChemistry and biology of pteridines  aNew York  bElsevier  c1979  a713  Pages  aRs .356 .00           aBio chemistry  alumazine semiquinones  aorbital theory