===================================================================== ==> In this proposal, more time is being requested for BBEZARD.JUPSAT_1 ===================================================================== We propose to search for spectral signatures from diacetylene (C4H2), benzene (C6H6), and methyl radical (CH3) on Jupiter, using the F-P mode of the SWS. These observations are a follow-up of the accepted proposal JUPSAT_1 in which we originally proposed to search for C4H2 and C6H6 on both Jupiter and Saturn. The Jupiter observations had to be removed to fit within the allocated time. These undetected hydrocarbons are expected to be produced from the photochemistry of methane in the high atmosphere. Diacetylene is the first step in the formation of polyacetylenes which may contribute to the stratospheric hazes. Benzene is the simplest aromatic molecule and may be a pathway to the formation of more complex aromatics which could contribute to the yellowish chromophores and to the formation of a photochemical smog. Methyl radical is the key pathway to the formation of ethane, the most abundant hydrocarbon. Detecting these molecules would provide an important test for some chemical schemes proposed in photochemical models, and help determining some poorly constrained atmospheric parameters such as the eddy mixing profile. In addition, we propose to search for emission from carbon dioxide (CO2) which is predicted to have been formed in detectable quantities following the Shoemaker-Levy 9 impacts in July 1994. Detection of CO2 more than two years after the impacts would be important to illuminate issues related to the composition and thermochemical processing in the fireball and plume. It would also provide crucial information on the long-term photochemical processes occuring after the impacts and on the horizontal spreading of the plume material.