MOSCOW, RUSSIA - CIRCA MAY, 2016: a post stamp printed in SWITZERLAND shows Difluorbutane molecule: 3 different formula, dedicated to International Chemics Nomenclature Conference, circa 1992

MOSCOW, RUSSIA - CIRCA MAY, 2016: a post stamp printed in SWITZERLAND shows Difluorbutane molecule: 3 different formula, dedicated to International Chemics Nomenclature Conference, circa 1992 - 60879746

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