USP Raloxifene Hydrochloride RS.
USP Ramipril RS
![Click to View Structure](../images/impurity_up.gif) .
USP Ramipril Related Compound A RS
[(2 S,3a S,6a S)-1-[( S)2-[[( S)1-(methoxycarbonyl)-3-phenylpropyl]amino]-1-oxopropyl]-octahydrocyclopenta[ b]pyrrole-2-carboxylic acid ]
(C 22H 30N 2O 5
![](../images/chars/blank.gif) 402.48)
.
USP Ramipril Related Compound B RS
[(2 S,3a S,6a S)-1-[( S)2-[[( S)1-(methylethoxy)carbonyl-3-phenylpropyl]amino]-1-oxopropyl]-octahydrocyclopenta[ b]pyrrole-2-carboxylic acid ]
(C 24H 34N 2O 5
![](../images/chars/blank.gif) 430.54)
.
USP Ramipril Related Compound C RS
[(2 S,3a S,6a S)-1-[( S)2-[[( S)1-ethoxycarbonyl-3-cyclohexyl propyl]amino]-1-oxopropyl]-octahydrocyclopenta[ b]pyrrole-2-carboxylic acid ]
(C 23H 38N 2O 5
![](../images/chars/blank.gif) 422.56)
.
USP Ramipril Related Compound D RS
[ethyl (2 S)2-[(3 S,5a S,8a S, 9 aS)-3-methyl-1,4-dioxodecahydro-1 H-cyclopenta[ e]pyrrolo[1,2- a]pyrazin-2-yl]-4-phenyl-butanoate ] Ramipril Diketopiperazine
(C 23H 30N 2O 4
![](../images/chars/blank.gif) 398.50)
.
USP Ranitidine Hydrochloride RS
![Click to View Structure](../images/impurity_up.gif) .
USP Ranitidine Related Compound A RS
[5-[[(2-aminoethyl)thio]methyl]- N, N-dimethyl-2-furanmethanamine, hemifumarate salt ]
.
USP Ranitidine Related Compound B RS
[N,N¢-bis[2-[[[5-[(dimethylamino)methyl]-2-furanyl]methyl]thio]ethyl]-2-nitro-1,1-ethenediamine ]
.
USP Ranitidine Related Compound C RS
[N-[2-[[[5-[(dimethylamino)methyl]-2-furanyl]methyl]sulfinyl]ethyl]- N-methyl-2-nitro-1,1-ethenediamine ]
.
USP Ranitidine Resolution Mixture RS
![Click to View Structure](../images/impurity_up.gif) It is a mixture of ranitidine hydrochloride and four related impurities: ranitidine- N-oxide, ranitidine complex nitroacetamide, ranitidine diamine hemifumarate, and ranitidine amino alcohol hemifumarate.
Ranitidine-N-oxide: N,N-dimethyl[5-[[[2-[[1-(methylamino)-2-nitroethenyl]amino]ethyl]sulphanyl]methyl]furan-2-yl]methanamine N-oxide.
Ranitidine complex nitroacetamide: N-[2-[[[5-[(dimethylamino)methyl]furan-2-yl]methyl]sulphanyl]ethyl]-2-nitroacetamide.
Ranitidine diamine hemifumarate (related compound A): [5-[[(2-aminoethyl)thio]methyl]-N,N-dimethyl-2-furanmethanamine, hemifumarate salt].
Ranitidine amino alcohol hemifumarate: [5-[(dimethylamino)methyl]furan-2-yl]methanol.
USP Rauwolfia Serpentina RS
.
USP Repaglinide RS
![Click to View Structure](../images/impurity_up.gif) .
USP Repaglinide Related Compound A RS
[( S)-3-methyl-1-[2-(1-piperidinyl)phenyl]butylamine, N-acetyl- l-glutamate salt ]
(C 16H 26N 2·C 7H 11NO 5
![](../images/chars/blank.gif) 435.6)
.
USP Repaglinide Related Compound B RS
[3-ethoxy-4-ethoxycarbonylphenylacetic acid ]
(C 13H 16O 5
![](../images/chars/blank.gif) 252.27)
.
USP Repaglinide Related Compound C RS
[( S)-2-ethoxy-4-[2-[[2-phenyl-1-[2-(1-piperidinyl)phenyl]ethyl]amino]-2-oxoethyl]benzoic acid ]
(C 30H 34N 2O 4
![](../images/chars/blank.gif) 486.61)
.
USP Reserpine RS
![Click to View Structure](../images/impurity_up.gif) .
USP Resorcinol RS
![Click to View Structure](../images/impurity_up.gif) .
USP Ribavirin RS
![Click to View Structure](../images/impurity_up.gif) .
USP Riboflavin RS
![Click to View Structure](../images/impurity_up.gif) .
USP Rifabutin RS
![Click to View Structure](../images/impurity_up.gif) .
USP Rifampin RS
![Click to View Structure](../images/impurity_up.gif) .
USP Rifampin Quinone RS
.
USP Rimexolone RS
![Click to View Structure](../images/impurity_up.gif) .
USP Risperidone RS
[3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidino]ethyl]-6,7,8,9-tetrahydro-2-methyl-4 H-pyrido[1,2- a]pyrimidin-4-one ]
![](../images/chars/blank.gif) (410.48 ![](../images/chars/loz.gif) CAS-106266-06-2).
USP Risperidone System Suitability Mixture RS
Contains risperidone and about 0.2% of each of the following:
Z-oxime-3-[2-[4-[(Z)-(2,4-difluorophenyl)(hydroxyimino)methyl]piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one;
9-hydroxyrisperidone-(6RS)-3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl]ethyl]-2,6-dimethyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one;
6-methylrisperidone-(6RS)-3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl]ethyl]-2,6-dimethyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one.
USP Ritodrine Hydrochloride RS
![Click to View Structure](../images/impurity_up.gif) .
USP Ritonavir RS.
USP Ritonavir Related Compounds Mixture RS.
USP Ropivacaine Hydrochloride RS.
USP Ropivacaine Related Compound A RS
[2,6-dimethylaniline hydrochloride ]
(C 8H 12ClN
![](../images/chars/blank.gif) 157.64. ![](../images/chars/loz.gif) CAS-21436-98-6).
USP Ropivacaine Related Compound B RS
[(R)-ropivacaine hydrochloride monohydrate; (R)-()-1-propylpiperidene-2-carboxylic acid (2,6-dimethylphenyl)-amide hydrochloride monohydrate ]
(C 17H 26N 2O
![](../images/chars/blank.gif) 328.89).
USP Roxarsone RS
![Click to View Structure](../images/impurity_up.gif) .
USP Rutin RS
![Click to View Structure](../images/impurity_up.gif) .
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